diff --git a/config.json.example b/config.json.example
index 2fd677c7d4..5b03d26791 100644
--- a/config.json.example
+++ b/config.json.example
@@ -74,5 +74,9 @@
         "APP_ID": "appId",
         "KEY": "key",
         "SECRET": "secret"
+    },
+    "SLACK": {
+        "FLAGGING_URL": "https://hooks.slack.com/services/id/id/id",
+        "FLAGGING_FOOTER_LINK": "https://crookedneighbor.github.io/flag-o-rama/"
     }
 }
diff --git a/package.json b/package.json
index 71da316005..046b6c81b4 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,7 @@
   "version": "3.37.0",
   "main": "./website/server/index.js",
   "dependencies": {
+    "@slack/client": "slackhq/node-slack-sdk#2ee794cd31326c54f38c518eef2b9d223327d939",
     "accepts": "^1.3.2",
     "amazon-payments": "0.0.4",
     "amplitude": "^2.0.3",
@@ -89,12 +90,12 @@
     "superagent": "^1.8.3",
     "swagger-node-express": "lefnire/swagger-node-express#habitrpg",
     "universal-analytics": "~0.3.2",
+    "useragent": "2.1.9",
     "uuid": "^2.0.1",
     "validator": "^4.9.0",
     "vinyl-buffer": "^1.0.0",
     "vinyl-source-stream": "^1.1.0",
-    "winston": "^2.1.0",
-    "useragent": "2.1.9"
+    "winston": "^2.1.0"
   },
   "private": true,
   "engines": {
diff --git a/test/api/v3/unit/libs/slack.js b/test/api/v3/unit/libs/slack.js
new file mode 100644
index 0000000000..b3d579349a
--- /dev/null
+++ b/test/api/v3/unit/libs/slack.js
@@ -0,0 +1,97 @@
+/* eslint-disable camelcase */
+import { IncomingWebhook } from '@slack/client';
+import slack from '../../../../../website/server/libs/slack';
+import { TAVERN_ID } from '../../../../../website/server/models/group';
+
+describe('slack', () => {
+  describe('sendFlagNotification', () => {
+    let flagger, group, message;
+
+    beforeEach(() => {
+      sandbox.stub(IncomingWebhook.prototype, 'send');
+      flagger = {
+        id: 'flagger-id',
+        profile: {
+          name: 'flagger',
+        },
+      };
+      group = {
+        id: 'group-id',
+        privacy: 'private',
+        name: 'Some group',
+        type: 'guild',
+      };
+      message = {
+        id: 'chat-id',
+        user: 'Author',
+        uuid: 'author-id',
+        text: 'some text',
+      };
+    });
+
+    afterEach(() => {
+      IncomingWebhook.prototype.send.restore();
+    });
+
+    it('sends a slack webhook', () => {
+      slack.sendFlagNotification({
+        flagger,
+        group,
+        message,
+      });
+
+      expect(IncomingWebhook.prototype.send).to.be.calledOnce;
+      expect(IncomingWebhook.prototype.send).to.be.calledWith({
+        text: 'flagger (flagger-id) flagged a message',
+        attachments: [{
+          fallback: 'Flag Message',
+          color: 'danger',
+          author_name: 'Author - author-id',
+          title: 'Flag in Some group - (private guild)',
+          title_link: undefined,
+          text: 'some text',
+          footer: sandbox.match(/<.*?groupId=group-id&chatId=chat-id\|Flag this message>/),
+          mrkdwn_in: [
+            'text',
+          ],
+        }],
+      });
+    });
+
+    it('includes a title link if guild is public', () => {
+      group.privacy = 'public';
+
+      slack.sendFlagNotification({
+        flagger,
+        group,
+        message,
+      });
+
+      expect(IncomingWebhook.prototype.send).to.be.calledWithMatch({
+        attachments: [sandbox.match({
+          title: 'Flag in Some group',
+          title_link: sandbox.match(/.*\/#\/options\/groups\/guilds\/group-id/),
+        })],
+      });
+    });
+
+    it('links to tavern', () => {
+      group.privacy = 'public';
+      group.name = 'Tavern';
+      group.id = TAVERN_ID;
+
+      slack.sendFlagNotification({
+        flagger,
+        group,
+        message,
+      });
+
+      expect(IncomingWebhook.prototype.send).to.be.calledWithMatch({
+        attachments: [sandbox.match({
+          title: 'Flag in Tavern',
+          title_link: sandbox.match(/.*\/#\/options\/groups\/tavern/),
+        })],
+      });
+    });
+  });
+});
diff --git a/website/server/controllers/api-v3/chat.js b/website/server/controllers/api-v3/chat.js
index ea74d4238e..4dded03e9b 100644
--- a/website/server/controllers/api-v3/chat.js
+++ b/website/server/controllers/api-v3/chat.js
@@ -8,6 +8,7 @@ import {
 import _ from 'lodash';
 import { removeFromArray } from '../../libs/collectionManipulators';
 import { getUserInfo, getGroupUrl, sendTxn } from '../../libs/email';
+import slack from '../../libs/slack';
 import pusher from '../../libs/pusher';
 import nconf from 'nconf';
 import Bluebird from 'bluebird';
@@ -265,6 +266,12 @@ api.flagChat = {
       {name: 'GROUP_URL', content: groupUrl},
     ]);
 
+    slack.sendFlagNotification({
+      flagger: user,
+      group,
+      message,
+    });
+
     res.respond(200, message);
   },
 };
diff --git a/website/server/libs/slack.js b/website/server/libs/slack.js
new file mode 100644
index 0000000000..e67ab26030
--- /dev/null
+++ b/website/server/libs/slack.js
@@ -0,0 +1,48 @@
+/* eslint-disable camelcase */
+import { IncomingWebhook } from '@slack/client';
+import { TAVERN_ID } from '../models/group';
+import nconf from 'nconf';
+
+const SLACK_FLAGGING_URL = nconf.get('SLACK:FLAGGING_URL');
+const SLACK_FLAGGING_FOOTER_LINK = nconf.get('SLACK:FLAGGING_FOOTER_LINK');
+const BASE_URL = nconf.get('BASE_URL');
+
+let flagSlack = new IncomingWebhook(SLACK_FLAGGING_URL);
+
+function sendFlagNotification ({
+  flagger,
+  group,
+  message,
+}) {
+  let titleLink;
+  let title = `Flag in ${group.name}`;
+  let text = `${flagger.profile.name} (${flagger.id}) flagged a message`;
+
+  if (group.id === TAVERN_ID) {
+    titleLink = `${BASE_URL}/#/options/groups/tavern`;
+  } else if (group.privacy === 'public') {
+    titleLink = `${BASE_URL}/#/options/groups/guilds/${group.id}`;
+  } else {
+    title += ` - (${group.privacy} ${group.type})`;
+  }
+
+  flagSlack.send({
+    text,
+    attachments: [{
+      fallback: 'Flag Message',
+      color: 'danger',
+      author_name: `${message.user} - ${message.uuid}`,
+      title,
+      title_link: titleLink,
+      text: message.text,
+      footer: `<${SLACK_FLAGGING_FOOTER_LINK}?groupId=${group.id}&chatId=${message.id}|Flag this message>`,
+      mrkdwn_in: [
+        'text',
+      ],
+    }],
+  });
+}
+
+module.exports = {
+  sendFlagNotification,
+};