diff --git a/.gitignore b/.gitignore
index 9c55f2708..0ab845e4e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,5 +45,6 @@ plugins/*
 !plugins/talk-plugin-deep-reply-count
 !plugins/talk-plugin-subscriber
 !plugins/talk-plugin-flag-details
+!plugins/talk-plugin-slack-notifications
 
 **/node_modules/*
diff --git a/plugins/talk-plugin-slack-notifications/.eslintrc.json b/plugins/talk-plugin-slack-notifications/.eslintrc.json
new file mode 100644
index 000000000..78f7c2397
--- /dev/null
+++ b/plugins/talk-plugin-slack-notifications/.eslintrc.json
@@ -0,0 +1,3 @@
+{
+  "extends": "@coralproject/eslint-config-talk"
+}
diff --git a/plugins/talk-plugin-slack-notifications/index.js b/plugins/talk-plugin-slack-notifications/index.js
new file mode 100644
index 000000000..1f2a73ff0
--- /dev/null
+++ b/plugins/talk-plugin-slack-notifications/index.js
@@ -0,0 +1,5 @@
+const hooks = require('./server/hooks');
+
+module.exports = {
+  hooks,
+};
diff --git a/plugins/talk-plugin-slack-notifications/package.json b/plugins/talk-plugin-slack-notifications/package.json
new file mode 100644
index 000000000..6792e77fa
--- /dev/null
+++ b/plugins/talk-plugin-slack-notifications/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "@coralproject/talk-plugin-slack-notifications",
+  "pluginName": "talk-plugin-slack-notifications",
+  "version": "0.0.1",
+  "description": "Posts new comments to Slack via a webhook",
+  "main": "index.js",
+  "author": "The Coral Project Team <coral@mozillafoundation.org>",
+  "license": "Apache-2.0"
+}
diff --git a/plugins/talk-plugin-slack-notifications/server/config.js b/plugins/talk-plugin-slack-notifications/server/config.js
new file mode 100644
index 000000000..7571565b0
--- /dev/null
+++ b/plugins/talk-plugin-slack-notifications/server/config.js
@@ -0,0 +1,11 @@
+const config = {
+  SLACK_WEBHOOK_URL: process.env.TALK_SLACK_WEBHOOK_URL,
+  SLACK_WEBHOOK_TIMEOUT: process.env.TALK_SLACK_WEBHOOK_TIMEOUT || 5000,
+};
+
+if (process.env.NODE_ENV !== 'test' && !config.SLACK_WEBHOOK_URL) {
+  // TODO this error should point users to Talk's Slack app once that's in place
+  throw new Error('Please set the TALK_SLACK_WEBHOOK_URL environment variable to use the slack-notifications plugin.');
+}
+
+module.exports = config;
diff --git a/plugins/talk-plugin-slack-notifications/server/hooks.js b/plugins/talk-plugin-slack-notifications/server/hooks.js
new file mode 100644
index 000000000..bda9dc4f5
--- /dev/null
+++ b/plugins/talk-plugin-slack-notifications/server/hooks.js
@@ -0,0 +1,46 @@
+const fetch = require('node-fetch');
+const {SLACK_WEBHOOK_URL, SLACK_WEBHOOK_TIMEOUT} = require('./config');
+const debug = require('debug')('talk:plugin:slack-notifications');
+
+// We don't add the hooks during _test_ as the Slack API is not available.
+if (process.env.NODE_ENV === 'test') {
+  return null;
+}
+
+module.exports = {
+  RootMutation: {
+    createComment: {
+      async post(_, {input}, context, _info, result) {
+        debug(`Posting notification to Slack webhook: ${SLACK_WEBHOOK_URL}`);
+        const {
+          comment: {
+            body: text,
+            created_at: createdAt
+          }
+        } = result;
+        const username = context.user.username;
+        process.nextTick(async () => {
+          const response = await fetch(SLACK_WEBHOOK_URL, {
+            method: 'POST',
+            headers: {
+              'Content-Type': 'application/json',
+            },
+            timeout: SLACK_WEBHOOK_TIMEOUT,
+            body: JSON.stringify({
+              attachments: [{
+                text: text,
+                footer: `Comment by ${username}`,
+                ts: Math.floor(Date.parse(createdAt) / 1000),
+              }]
+            }),
+          });
+          if (!response.ok) {
+            const responseText = await response.text();
+            console.trace(`Posting to Slack failed with HTTP code ${response.status} and body '${responseText}'`);
+          }
+        });
+        return result;
+      },
+    },
+  },
+};