diff --git a/src/components/modal/comments/delete-comment.jsx b/src/components/modal/comments/delete-comment.jsx
new file mode 100644
index 000000000..0d2264854
--- /dev/null
+++ b/src/components/modal/comments/delete-comment.jsx
@@ -0,0 +1,81 @@
+const PropTypes = require('prop-types');
+const React = require('react');
+const FormattedMessage = require('react-intl').FormattedMessage;
+const injectIntl = require('react-intl').injectIntl;
+const intlShape = require('react-intl').intlShape;
+const Modal = require('../base/modal.jsx');
+
+const Button = require('../../forms/button.jsx');
+const FlexRow = require('../../flex-row/flex-row.jsx');
+
+require('../../forms/button.scss');
+require('./modal.scss');
+
+const DeleteModal = ({
+    intl,
+    onDelete,
+    onReport,
+    onRequestClose,
+    ...modalProps
+}) => (
+    <Modal
+        useStandardSizes
+        className="mod-report"
+        contentLabel={intl.formatMessage({id: 'comments.deleteModal.title'})}
+        onRequestClose={onRequestClose}
+        {...modalProps}
+    >
+        <div>
+            <div className="report-modal-header">
+                <div className="report-content-label">
+                    <FormattedMessage id="comments.deleteModal.title" />
+                </div>
+            </div>
+
+            <div className="report-modal-content">
+                <div>
+                    <div className="instructions">
+                        <FormattedMessage id="comments.deleteModal.body" />
+                    </div>
+                </div>
+            </div>
+            <FlexRow className="action-buttons">
+                <div className="action-buttons-overflow-fix">
+                    <Button
+                        className="action-button submit-button"
+                        type="button"
+                        onClick={onRequestClose}
+                    >
+                        <div className="action-button-text">
+                            <FormattedMessage id="general.close" />
+                        </div>
+                    </Button>
+                    <Button
+                        className="action-button submit-button"
+                        type="button"
+                        onClick={onReport}
+                    >
+                        <FormattedMessage id="comments.report" />
+                    </Button>
+                    <Button
+                        className="action-button submit-button"
+                        type="button"
+                        onClick={onDelete}
+                    >
+                        <FormattedMessage id="comments.delete" />
+                    </Button>
+                </div>
+            </FlexRow>
+        </div>
+    </Modal>
+);
+
+
+DeleteModal.propTypes = {
+    intl: intlShape,
+    onDelete: PropTypes.func,
+    onReport: PropTypes.func,
+    onRequestClose: PropTypes.func
+};
+
+module.exports = injectIntl(DeleteModal);
diff --git a/src/components/modal/comments/modal.scss b/src/components/modal/comments/modal.scss
new file mode 100644
index 000000000..40a526fe3
--- /dev/null
+++ b/src/components/modal/comments/modal.scss
@@ -0,0 +1,44 @@
+@import "../../../colors";
+@import "../../../frameless";
+
+$medium-and-small: "screen and (max-width : #{$tablet}-1)";
+
+.mod-report * {
+    box-sizing: border-box;
+}
+
+.mod-report {
+    margin: 100px auto;
+    outline: none;
+    padding: 0;
+    width: 36.25rem; /* 580px; */
+    user-select: none;
+}
+
+.report-modal-header {
+    border-radius: 1rem 1rem 0 0;
+    box-shadow: inset 0 -1px 0 0 $ui-coral-dark;
+    background-color: $ui-coral;
+    padding-top: .75rem;
+    width: 100%;
+    height: 3rem;
+    box-sizing: border-box;
+}
+
+.report-content-label {
+    text-align: center;
+    color: $type-white;
+    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
+    font-size: 1rem;
+    font-weight: bold;
+}
+
+.report-modal-content {
+    margin: 1rem auto;
+    width: 80%;
+    font-size: .875rem;
+
+    .instructions {
+        line-height: 1.5rem;
+    }
+}
diff --git a/src/components/modal/comments/report-comment.jsx b/src/components/modal/comments/report-comment.jsx
new file mode 100644
index 000000000..197484dfe
--- /dev/null
+++ b/src/components/modal/comments/report-comment.jsx
@@ -0,0 +1,84 @@
+const PropTypes = require('prop-types');
+const React = require('react');
+const FormattedMessage = require('react-intl').FormattedMessage;
+const injectIntl = require('react-intl').injectIntl;
+const intlShape = require('react-intl').intlShape;
+const Modal = require('../base/modal.jsx');
+
+const Button = require('../../forms/button.jsx');
+const FlexRow = require('../../flex-row/flex-row.jsx');
+
+require('../../forms/button.scss');
+require('./modal.scss');
+
+const ReportModal = ({
+    intl,
+    isConfirmed,
+    onReport,
+    onRequestClose,
+    ...modalProps
+}) => (
+    <Modal
+        useStandardSizes
+        className="mod-report"
+        contentLabel={intl.formatMessage({id: 'comments.reportModal.title'})}
+        onRequestClose={onRequestClose}
+        {...modalProps}
+    >
+        <div>
+            <div className="report-modal-header">
+                <div className="report-content-label">
+                    <FormattedMessage id="comments.reportModal.title" />
+                </div>
+            </div>
+
+            <div className="report-modal-content">
+                <div>
+                    <div className="instructions">
+                        {isConfirmed ? (
+                            <FormattedMessage id="comments.reportModal.reported" />
+                        ) : (
+                            <FormattedMessage id="comments.reportModal.prompt" />
+                        )}
+                    </div>
+                </div>
+            </div>
+            <FlexRow className="action-buttons">
+                <div className="action-buttons-overflow-fix">
+                    <Button
+                        className="action-button submit-button"
+                        type="button"
+                        onClick={onRequestClose}
+                    >
+                        <div className="action-button-text">
+                            <FormattedMessage id="general.close" />
+                        </div>
+                    </Button>
+                    {isConfirmed ? null : (
+                        <Button
+                            className="action-button submit-button"
+                            type="button"
+                            onClick={onReport}
+                        >
+                            <div className="action-button-text">
+                                <FormattedMessage id="comments.report" />
+                            </div>
+                        </Button>
+                    )}
+                </div>
+            </FlexRow>
+        </div>
+    </Modal>
+);
+
+
+ReportModal.propTypes = {
+    intl: intlShape,
+    isConfirmed: PropTypes.bool,
+    isOwnSpace: PropTypes.bool,
+    onReport: PropTypes.func,
+    onRequestClose: PropTypes.func,
+    type: PropTypes.string
+};
+
+module.exports = injectIntl(ReportModal);
diff --git a/src/l10n.json b/src/l10n.json
index 13e327d37..422f8017d 100644
--- a/src/l10n.json
+++ b/src/l10n.json
@@ -202,5 +202,14 @@
     "report.tooShortError": "That's too short. Please describe in detail what's inappropriate or disrespectful about the project.",
     "report.send": "Send",
     "report.sending": "Sending...",
-    "report.textMissing": "Please tell us why you are reporting this project"
+    "report.textMissing": "Please tell us why you are reporting this project",
+
+    "comments.report": "Report",
+    "comments.delete": "Delete",
+    "comments.reportModal.title": "Report Comment",
+    "comments.reportModal.reported": "The comment has been reported, and the Scratch Team has been notified.",
+    "comments.reportModal.prompt": "Are you sure you want to report this comment?",
+    "comments.deleteModal.title": "Delete Comment",
+    "comments.deleteModal.body": "Delete this comment? If the comment is mean or disrespectful, please click Report instead to let the Scratch Team know about it.",
+    "comments.reply": "reply"
 }
diff --git a/src/redux/preview.js b/src/redux/preview.js
index a151fe41c..fb1adc1a8 100644
--- a/src/redux/preview.js
+++ b/src/redux/preview.js
@@ -86,13 +86,13 @@ module.exports.previewReducer = (state, action) => {
         return Object.assign({}, state, {
             comments: [...state.comments, ...action.items] // TODO: consider a different way of doing this?
         });
-    case 'SET_COMMENT_DELETED':
+    case 'UPDATE_COMMENT':
         if (action.topLevelCommentId) {
             return Object.assign({}, state, {
                 replies: Object.assign({}, state.replies, {
                     [action.topLevelCommentId]: state.replies[action.topLevelCommentId].map(comment => {
                         if (comment.id === action.commentId) {
-                            return Object.assign({}, comment, {deleted: true});
+                            return Object.assign({}, comment, action.comment);
                         }
                         return comment;
                     })
@@ -103,7 +103,7 @@ module.exports.previewReducer = (state, action) => {
         return Object.assign({}, state, {
             comments: state.comments.map(comment => {
                 if (comment.id === action.commentId) {
-                    return Object.assign({}, comment, {deleted: true});
+                    return Object.assign({}, comment, action.comment);
                 }
                 return comment;
             })
@@ -229,9 +229,21 @@ module.exports.setStudioFetchStatus = (studioId, status) => ({
 });
 
 module.exports.setCommentDeleted = (commentId, topLevelCommentId) => ({
-    type: 'SET_COMMENT_DELETED',
+    type: 'UPDATE_COMMENT',
     commentId: commentId,
-    topLevelCommentId: topLevelCommentId
+    topLevelCommentId: topLevelCommentId,
+    comment: {
+        deleted: true
+    }
+});
+
+module.exports.setCommentReported = (commentId, topLevelCommentId) => ({
+    type: 'UPDATE_COMMENT',
+    commentId: commentId,
+    topLevelCommentId: topLevelCommentId,
+    comment: {
+        reported: true
+    }
 });
 
 module.exports.addNewComment = (comment, topLevelCommentId) => ({
@@ -611,7 +623,7 @@ module.exports.updateProject = (id, jsonData, username, token) => (dispatch => {
     });
 });
 
-module.exports.deleteComment = (projectId, commentId, token) => (dispatch => {
+module.exports.deleteComment = (projectId, commentId, topLevelCommentId, token) => (dispatch => {
     /* TODO fetching/fetched/error states updates for comment deleting */
     api({
         uri: `/proxy/comments/project/${projectId}`,
@@ -627,7 +639,24 @@ module.exports.deleteComment = (projectId, commentId, token) => (dispatch => {
             log.error(err || res.body);
             return;
         }
-        dispatch(module.exports.setCommentDeleted(commentId));
+        dispatch(module.exports.setCommentDeleted(commentId, topLevelCommentId));
+    });
+});
+
+module.exports.reportComment = (projectId, commentId, topLevelCommentId, token) => (dispatch => {
+    api({
+        uri: `/proxy/project/${projectId}/comment/${commentId}/report`,
+        authentication: token,
+        withCredentials: true,
+        method: 'POST',
+        useCsrf: true
+    }, (err, body, res) => {
+        if (err || res.statusCode !== 200) {
+            log.error(err || res.body);
+            return;
+        }
+        // TODO use the reportId in the response for unreporting functionality
+        dispatch(module.exports.setCommentReported(commentId, topLevelCommentId));
     });
 });
 
diff --git a/src/views/preview/comment/comment.jsx b/src/views/preview/comment/comment.jsx
index d5e4bede0..067e8aabd 100644
--- a/src/views/preview/comment/comment.jsx
+++ b/src/views/preview/comment/comment.jsx
@@ -6,7 +6,10 @@ const classNames = require('classnames');
 const FlexRow = require('../../../components/flex-row/flex-row.jsx');
 const Avatar = require('../../../components/avatar/avatar.jsx');
 const FormattedRelative = require('react-intl').FormattedRelative;
+const FormattedMessage = require('react-intl').FormattedMessage;
 const ComposeComment = require('./compose-comment.jsx');
+const DeleteCommentModal = require('../../../components/modal/comments/delete-comment.jsx');
+const ReportCommentModal = require('../../../components/modal/comments/report-comment.jsx');
 
 require('./comment.scss');
 
@@ -15,10 +18,18 @@ class Comment extends React.Component {
         super(props);
         bindAll(this, [
             'handleDelete',
+            'handleCancelDelete',
+            'handleConfirmDelete',
+            'handleReport',
+            'handleConfirmReport',
+            'handleCancelReport',
             'handlePostReply',
             'handleToggleReplying'
         ]);
         this.state = {
+            deleting: false,
+            reporting: false,
+            reportConfirmed: false,
             replying: false
         };
     }
@@ -33,9 +44,39 @@ class Comment extends React.Component {
     }
 
     handleDelete () {
+        this.setState({deleting: true});
+    }
+
+    handleConfirmDelete () {
+        this.setState({deleting: false});
         this.props.onDelete(this.props.id);
     }
 
+    handleCancelDelete () {
+        this.setState({deleting: false});
+    }
+
+    handleReport () {
+        this.setState({reporting: true});
+    }
+
+    handleConfirmReport () {
+        this.setState({
+            reporting: false,
+            reportConfirmed: true,
+            deleting: false // To close delete modal if reported from delete modal
+        });
+
+        this.props.onReport(this.props.id);
+    }
+
+    handleCancelReport () {
+        this.setState({
+            reporting: false,
+            reportConfirmed: false
+        });
+    }
+
     render () {
         const {
             author,
@@ -45,7 +86,8 @@ class Comment extends React.Component {
             content,
             datetimeCreated,
             id,
-            projectId
+            projectId,
+            reported
         } = this.props;
 
         return (
@@ -68,18 +110,22 @@ class Comment extends React.Component {
                                     className="comment-delete"
                                     onClick={this.handleDelete}
                                 >
-                                    Delete {/* TODO internationalize */}
+                                    <FormattedMessage id="comments.delete" />
                                 </span>
                             ) : null}
-                            <span className="comment-report">
-                                Report {/* TODO internationalize */}
+                            <span
+                                className="comment-report"
+                                onClick={this.handleReport}
+                            >
+                                <FormattedMessage id="comments.report" />
                             </span>
                         </div>
                     </FlexRow>
                     <div
                         className={classNames({
                             'comment-bubble': true,
-                            'comment-bubble-deleted': deleted
+                            'comment-bubble-deleted': deleted,
+                            'comment-bubble-reported': reported
                         })}
                     >
                         {/* TODO: at the moment, comment content does not properly display
@@ -97,11 +143,12 @@ class Comment extends React.Component {
                                     className="comment-reply"
                                     onClick={this.handleToggleReplying}
                                 >
-                                    reply
+                                    <FormattedMessage id="comments.reply" />
                                 </span>
                             ) : null}
                         </FlexRow>
                     </div>
+
                     {this.state.replying ? (
                         <FlexRow className="comment-reply-row">
                             <ComposeComment
@@ -113,6 +160,24 @@ class Comment extends React.Component {
                         </FlexRow>
                     ) : null}
                 </FlexRow>
+                {this.state.deleting ? (
+                    <DeleteCommentModal
+                        isOpen
+                        key="delete-comment-modal"
+                        onDelete={this.handleConfirmDelete}
+                        onReport={this.handleConfirmReport}
+                        onRequestClose={this.handleCancelDelete}
+                    />
+                ) : null}
+                {(this.state.reporting || this.state.reportConfirmed) ? (
+                    <ReportCommentModal
+                        isOpen
+                        isConfirmed={this.state.reportConfirmed}
+                        key="report-comment-modal"
+                        onReport={this.handleConfirmReport}
+                        onRequestClose={this.handleCancelReport}
+                    />
+                ) : null}
             </div>
         );
     }
@@ -132,7 +197,9 @@ Comment.propTypes = {
     id: PropTypes.number,
     onAddComment: PropTypes.func,
     onDelete: PropTypes.func,
-    projectId: PropTypes.number
+    onReport: PropTypes.func,
+    projectId: PropTypes.string,
+    reported: PropTypes.bool
 };
 
 module.exports = Comment;
diff --git a/src/views/preview/comment/comment.scss b/src/views/preview/comment/comment.scss
index 48d741a48..6214a2212 100644
--- a/src/views/preview/comment/comment.scss
+++ b/src/views/preview/comment/comment.scss
@@ -151,8 +151,8 @@
             }
 
             &.comment-bubble-deleted {
-                $deleted-outline:  #ff6680;
-                $deleted-background: rgb(236, 206, 223);
+                $deleted-outline:  $active-gray;
+                $deleted-background: rgb(215, 222, 234);
 
                 border-color: $deleted-outline;
                 background-color: $deleted-background;
@@ -162,6 +162,19 @@
                     background: $deleted-background;
                 }
             }
+
+            &.comment-bubble-reported {
+                $reported-outline:  #ff6680;
+                $reported-background: rgb(236, 206, 223);
+
+                border-color: $reported-outline;
+                background-color: $reported-background;
+
+                &:before {
+                    border-color: $reported-outline transparent $reported-outline $reported-outline;
+                    background: $reported-background;
+                }
+            }
         }
 
         .comment-content {
diff --git a/src/views/preview/comment/compose-comment.jsx b/src/views/preview/comment/compose-comment.jsx
index 0db753c58..73f07733c 100644
--- a/src/views/preview/comment/compose-comment.jsx
+++ b/src/views/preview/comment/compose-comment.jsx
@@ -183,7 +183,7 @@ ComposeComment.propTypes = {
     onAddComment: PropTypes.func,
     onCancel: PropTypes.func,
     parentId: PropTypes.number,
-    projectId: PropTypes.number,
+    projectId: PropTypes.string,
     user: PropTypes.shape({
         id: PropTypes.number,
         username: PropTypes.string,
diff --git a/src/views/preview/comment/top-level-comment.jsx b/src/views/preview/comment/top-level-comment.jsx
index 6cc67da91..62be1a13d 100644
--- a/src/views/preview/comment/top-level-comment.jsx
+++ b/src/views/preview/comment/top-level-comment.jsx
@@ -14,7 +14,8 @@ class TopLevelComment extends React.Component {
         bindAll(this, [
             'handleExpandThread',
             'handleAddComment',
-            'handleDeleteReply'
+            'handleDeleteReply',
+            'handleReportReply'
         ]);
         this.state = {
             expanded: false
@@ -33,6 +34,12 @@ class TopLevelComment extends React.Component {
         this.props.onDelete(commentId, this.props.id);
     }
 
+    handleReportReply (commentId) {
+        // Only apply topLevelCommentId for reporting replies
+        // The top level comment itself just gets passed onReport directly
+        this.props.onReport(commentId, this.props.id);
+    }
+
     handleAddComment (comment) {
         this.props.onAddComment(comment, this.props.id);
     }
@@ -47,7 +54,9 @@ class TopLevelComment extends React.Component {
             deleted,
             id,
             onDelete,
+            onReport,
             replies,
+            reported,
             projectId
         } = this.props;
 
@@ -56,7 +65,18 @@ class TopLevelComment extends React.Component {
                 <Comment
                     projectId={projectId}
                     onAddComment={this.handleAddComment}
-                    {...{author, content, datetimeCreated, deletable, deleted, canReply, id, onDelete}}
+                    {...{
+                        author,
+                        content,
+                        datetimeCreated,
+                        deletable,
+                        deleted,
+                        canReply,
+                        id,
+                        onDelete,
+                        onReport,
+                        reported
+                    }}
                 />
                 {replies.length > 0 &&
                     <FlexRow
@@ -78,8 +98,10 @@ class TopLevelComment extends React.Component {
                                 id={reply.id}
                                 key={reply.id}
                                 projectId={projectId}
+                                reported={reply.reported}
                                 onAddComment={this.handleAddComment}
                                 onDelete={this.handleDeleteReply}
+                                onReport={this.handleReportReply}
                             />
                         ))}
                     </FlexRow>
@@ -109,9 +131,11 @@ TopLevelComment.propTypes = {
     id: PropTypes.number,
     onAddComment: PropTypes.func,
     onDelete: PropTypes.func,
+    onReport: PropTypes.func,
     parentId: PropTypes.number,
     projectId: PropTypes.string,
-    replies: PropTypes.arrayOf(PropTypes.object)
+    replies: PropTypes.arrayOf(PropTypes.object),
+    reported: PropTypes.bool
 };
 
 module.exports = TopLevelComment;
diff --git a/src/views/preview/presentation.jsx b/src/views/preview/presentation.jsx
index 30993a680..43019d79b 100644
--- a/src/views/preview/presentation.jsx
+++ b/src/views/preview/presentation.jsx
@@ -74,6 +74,7 @@ const PreviewPresentation = ({
     onLoveClicked,
     onReportClicked,
     onReportClose,
+    onReportComment,
     onReportSubmit,
     onAddToStudioClicked,
     onAddToStudioClosed,
@@ -367,8 +368,10 @@ const PreviewPresentation = ({
                                                 parentId={comment.parent_id}
                                                 projectId={projectId}
                                                 replies={replies && replies[comment.id] ? replies[comment.id] : []}
+                                                reported={comment.reported}
                                                 onAddComment={onAddComment}
                                                 onDelete={onDeleteComment}
+                                                onReport={onReportComment}
                                             />
                                         ))}
                                         {comments.length < projectInfo.stats.comments &&
@@ -421,6 +424,7 @@ PreviewPresentation.propTypes = {
     onLoveClicked: PropTypes.func,
     onReportClicked: PropTypes.func.isRequired,
     onReportClose: PropTypes.func.isRequired,
+    onReportComment: PropTypes.func.isRequired,
     onReportSubmit: PropTypes.func.isRequired,
     onSeeInside: PropTypes.func,
     onToggleComments: PropTypes.func,
diff --git a/src/views/preview/preview.jsx b/src/views/preview/preview.jsx
index def3de3bd..a7db2a3f0 100644
--- a/src/views/preview/preview.jsx
+++ b/src/views/preview/preview.jsx
@@ -42,6 +42,7 @@ class Preview extends React.Component {
             'handlePopState',
             'handleReportClick',
             'handleReportClose',
+            'handleReportComment',
             'handleReportSubmit',
             'handleAddToStudioClick',
             'handleAddToStudioClose',
@@ -182,6 +183,9 @@ class Preview extends React.Component {
     handleDeleteComment (id, topLevelCommentId) {
         this.props.handleDeleteComment(this.state.projectId, id, topLevelCommentId, this.props.user.token);
     }
+    handleReportComment (id, topLevelCommentId) {
+        this.props.handleReportComment(this.state.projectId, id, topLevelCommentId, this.props.user.token);
+    }
     handleReportClick () {
         this.setState({reportOpen: true});
     }
@@ -363,6 +367,7 @@ class Preview extends React.Component {
                         onLoveClicked={this.handleLoveToggle}
                         onReportClicked={this.handleReportClick}
                         onReportClose={this.handleReportClose}
+                        onReportComment={this.handleReportComment}
                         onReportSubmit={this.handleReportSubmit}
                         onSeeInside={this.handleSeeInside}
                         onToggleComments={this.handleToggleComments}
@@ -419,6 +424,7 @@ Preview.propTypes = {
     handleLogIn: PropTypes.func,
     handleLogOut: PropTypes.func,
     handleOpenRegistration: PropTypes.func,
+    handleReportComment: PropTypes.func,
     handleToggleLoginOpen: PropTypes.func,
     isEditable: PropTypes.bool,
     isLoggedIn: PropTypes.bool,
@@ -548,6 +554,9 @@ const mapDispatchToProps = dispatch => ({
     handleDeleteComment: (projectId, commentId, topLevelCommentId, token) => {
         dispatch(previewActions.deleteComment(projectId, commentId, topLevelCommentId, token));
     },
+    handleReportComment: (projectId, commentId, topLevelCommentId, token) => {
+        dispatch(previewActions.reportComment(projectId, commentId, topLevelCommentId, token));
+    },
     handleOpenRegistration: event => {
         event.preventDefault();
         dispatch(navigationActions.setRegistrationOpen(true));