diff --git a/CHANGELOG.md b/CHANGELOG.md
index 781e807a..3db5d2d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ All notable changes to this project will be documented in this file.
 - Add experimental Dockerfile and docker-compose.yml
 - Add rate limiting for Pushover notifications (6 notifications / user / minute)
 - Add the WEBHOOKS_ENABLED setting (#471)
+- Add the SLACK_ENABLED setting (#471)
 
 ## Bug Fixes
 - Fix unwanted HTML escaping in SMS and WhatsApp notifications
diff --git a/docker/.env b/docker/.env
index d96a3e17..adf2e164 100644
--- a/docker/.env
+++ b/docker/.env
@@ -45,6 +45,7 @@ SITE_NAME=Mychecks
 SITE_ROOT=http://localhost:8000
 SLACK_CLIENT_ID=
 SLACK_CLIENT_SECRET=
+SLACK_ENABLED=True
 TELEGRAM_BOT_NAME=ExampleBot
 TELEGRAM_TOKEN=
 TRELLO_APP_KEY=
diff --git a/hc/api/tests/test_notify.py b/hc/api/tests/test_notify.py
index 3a22c228..0eb73268 100644
--- a/hc/api/tests/test_notify.py
+++ b/hc/api/tests/test_notify.py
@@ -8,7 +8,6 @@ from django.core import mail
 from django.utils.timezone import now
 from hc.api.models import Channel, Check, Notification, TokenBucket
 from hc.test import BaseTestCase
-from requests.exceptions import Timeout
 from django.test.utils import override_settings
 
 
@@ -72,63 +71,6 @@ class NotifyTestCase(BaseTestCase):
         self.assertFalse(mock_post.called)
         self.assertEqual(Notification.objects.count(), 0)
 
-    @patch("hc.api.transports.requests.request")
-    def test_slack(self, mock_post):
-        self._setup_data("slack", "123")
-        mock_post.return_value.status_code = 200
-
-        self.channel.notify(self.check)
-        assert Notification.objects.count() == 1
-
-        args, kwargs = mock_post.call_args
-        payload = kwargs["json"]
-        attachment = payload["attachments"][0]
-        fields = {f["title"]: f["value"] for f in attachment["fields"]}
-        self.assertEqual(fields["Last Ping"], "an hour ago")
-
-    @patch("hc.api.transports.requests.request")
-    def test_slack_with_complex_value(self, mock_post):
-        v = json.dumps({"incoming_webhook": {"url": "123"}})
-        self._setup_data("slack", v)
-        mock_post.return_value.status_code = 200
-
-        self.channel.notify(self.check)
-        assert Notification.objects.count() == 1
-
-        args, kwargs = mock_post.call_args
-        self.assertEqual(args[1], "123")
-
-    @patch("hc.api.transports.requests.request")
-    def test_slack_handles_500(self, mock_post):
-        self._setup_data("slack", "123")
-        mock_post.return_value.status_code = 500
-
-        self.channel.notify(self.check)
-
-        n = Notification.objects.get()
-        self.assertEqual(n.error, "Received status code 500")
-
-    @patch("hc.api.transports.requests.request", side_effect=Timeout)
-    def test_slack_handles_timeout(self, mock_post):
-        self._setup_data("slack", "123")
-
-        self.channel.notify(self.check)
-
-        n = Notification.objects.get()
-        self.assertEqual(n.error, "Connection timed out")
-
-    @patch("hc.api.transports.requests.request")
-    def test_slack_with_tabs_in_schedule(self, mock_post):
-        self._setup_data("slack", "123")
-        self.check.kind = "cron"
-        self.check.schedule = "*\t* * * *"
-        self.check.save()
-        mock_post.return_value.status_code = 200
-
-        self.channel.notify(self.check)
-        self.assertEqual(Notification.objects.count(), 1)
-        self.assertTrue(mock_post.called)
-
     @patch("hc.api.transports.requests.request")
     def test_hipchat(self, mock_post):
         self._setup_data("hipchat", "123")
diff --git a/hc/api/tests/test_notify_slack.py b/hc/api/tests/test_notify_slack.py
new file mode 100644
index 00000000..69202d7a
--- /dev/null
+++ b/hc/api/tests/test_notify_slack.py
@@ -0,0 +1,91 @@
+# coding: utf-8
+
+from datetime import timedelta as td
+import json
+from unittest.mock import patch
+
+from django.utils.timezone import now
+from hc.api.models import Channel, Check, Notification
+from hc.test import BaseTestCase
+from requests.exceptions import Timeout
+from django.test.utils import override_settings
+
+
+class NotifyTestCase(BaseTestCase):
+    def _setup_data(self, value, status="down", email_verified=True):
+        self.check = Check(project=self.project)
+        self.check.status = status
+        self.check.last_ping = now() - td(minutes=61)
+        self.check.save()
+
+        self.channel = Channel(project=self.project)
+        self.channel.kind = "slack"
+        self.channel.value = value
+        self.channel.email_verified = email_verified
+        self.channel.save()
+        self.channel.checks.add(self.check)
+
+    @patch("hc.api.transports.requests.request")
+    def test_slack(self, mock_post):
+        self._setup_data("123")
+        mock_post.return_value.status_code = 200
+
+        self.channel.notify(self.check)
+        assert Notification.objects.count() == 1
+
+        args, kwargs = mock_post.call_args
+        payload = kwargs["json"]
+        attachment = payload["attachments"][0]
+        fields = {f["title"]: f["value"] for f in attachment["fields"]}
+        self.assertEqual(fields["Last Ping"], "an hour ago")
+
+    @patch("hc.api.transports.requests.request")
+    def test_slack_with_complex_value(self, mock_post):
+        v = json.dumps({"incoming_webhook": {"url": "123"}})
+        self._setup_data(v)
+        mock_post.return_value.status_code = 200
+
+        self.channel.notify(self.check)
+        assert Notification.objects.count() == 1
+
+        args, kwargs = mock_post.call_args
+        self.assertEqual(args[1], "123")
+
+    @patch("hc.api.transports.requests.request")
+    def test_slack_handles_500(self, mock_post):
+        self._setup_data("123")
+        mock_post.return_value.status_code = 500
+
+        self.channel.notify(self.check)
+
+        n = Notification.objects.get()
+        self.assertEqual(n.error, "Received status code 500")
+
+    @patch("hc.api.transports.requests.request", side_effect=Timeout)
+    def test_slack_handles_timeout(self, mock_post):
+        self._setup_data("123")
+
+        self.channel.notify(self.check)
+
+        n = Notification.objects.get()
+        self.assertEqual(n.error, "Connection timed out")
+
+    @patch("hc.api.transports.requests.request")
+    def test_slack_with_tabs_in_schedule(self, mock_post):
+        self._setup_data("123")
+        self.check.kind = "cron"
+        self.check.schedule = "*\t* * * *"
+        self.check.save()
+        mock_post.return_value.status_code = 200
+
+        self.channel.notify(self.check)
+        self.assertEqual(Notification.objects.count(), 1)
+        self.assertTrue(mock_post.called)
+
+    @override_settings(SLACK_ENABLED=False)
+    def test_it_requires_slack_enabled(self):
+        self._setup_data("123")
+        self.channel.notify(self.check)
+
+        n = Notification.objects.get()
+        self.assertEqual(n.error, "Slack notifications are not enabled.")
diff --git a/hc/api/transports.py b/hc/api/transports.py
index 854c376f..39826256 100644
--- a/hc/api/transports.py
+++ b/hc/api/transports.py
@@ -263,6 +263,9 @@ class Webhook(HttpTransport):
 
 class Slack(HttpTransport):
     def notify(self, check):
+        if not settings.SLACK_ENABLED:
+            return "Slack notifications are not enabled."
+
         text = tmpl("slack_message.json", check=check)
         payload = json.loads(text)
         return self.post(self.channel.slack_webhook_url, json=payload)
diff --git a/hc/front/tests/test_add_slack.py b/hc/front/tests/test_add_slack.py
index 02ab92b6..ccf588e7 100644
--- a/hc/front/tests/test_add_slack.py
+++ b/hc/front/tests/test_add_slack.py
@@ -1,3 +1,4 @@
+from django.test.utils import override_settings
 from hc.api.models import Channel
 from hc.test import BaseTestCase
 
@@ -38,3 +39,9 @@ class AddSlackTestCase(BaseTestCase):
         self.client.login(username="bob@example.org", password="password")
         r = self.client.get(self.url)
         self.assertEqual(r.status_code, 403)
+
+    @override_settings(SLACK_ENABLED=False)
+    def test_it_handles_disabled_integration(self):
+        self.client.login(username="alice@example.org", password="password")
+        r = self.client.get(self.url)
+        self.assertEqual(r.status_code, 404)
diff --git a/hc/front/tests/test_add_slack_btn.py b/hc/front/tests/test_add_slack_btn.py
index 9dc7b22d..2fe0c335 100644
--- a/hc/front/tests/test_add_slack_btn.py
+++ b/hc/front/tests/test_add_slack_btn.py
@@ -34,3 +34,9 @@ class AddSlackBtnTestCase(BaseTestCase):
         self.client.login(username="bob@example.org", password="password")
         r = self.client.get(self.url)
         self.assertEqual(r.status_code, 403)
+
+    @override_settings(SLACK_ENABLED=False)
+    def test_it_handles_disabled_integration(self):
+        self.client.login(username="alice@example.org", password="password")
+        r = self.client.get(self.url)
+        self.assertEqual(r.status_code, 404)
diff --git a/hc/front/tests/test_add_slack_complete.py b/hc/front/tests/test_add_slack_complete.py
index 1a1617ca..0bdba714 100644
--- a/hc/front/tests/test_add_slack_complete.py
+++ b/hc/front/tests/test_add_slack_complete.py
@@ -81,3 +81,9 @@ class AddSlackCompleteTestCase(BaseTestCase):
         self.client.login(username="bob@example.org", password="password")
         r = self.client.get("/integrations/add_slack_btn/?code=12345678&state=foo")
         self.assertEqual(r.status_code, 403)
+
+    @override_settings(SLACK_ENABLED=False)
+    def test_it_requires_slack_enabled(self):
+        self.client.login(username="alice@example.org", password="password")
+        r = self.client.get("/integrations/add_slack_btn/?code=12345678&state=foo")
+        self.assertEqual(r.status_code, 404)
diff --git a/hc/front/views.py b/hc/front/views.py
index e78ad461..9b6b9171 100644
--- a/hc/front/views.py
+++ b/hc/front/views.py
@@ -300,6 +300,7 @@ def index(request):
         "enable_pushover": settings.PUSHOVER_API_TOKEN is not None,
         "enable_shell": settings.SHELL_ENABLED is True,
         "enable_signal": settings.SIGNAL_CLI_ENABLED is True,
+        "enable_slack": settings.SLACK_ENABLED is True,
         "enable_slack_btn": settings.SLACK_CLIENT_ID is not None,
         "enable_sms": settings.TWILIO_AUTH is not None,
         "enable_telegram": settings.TELEGRAM_TOKEN is not None,
@@ -767,6 +768,7 @@ def channels(request, code):
         "enable_pushover": settings.PUSHOVER_API_TOKEN is not None,
         "enable_shell": settings.SHELL_ENABLED is True,
         "enable_signal": settings.SIGNAL_CLI_ENABLED is True,
+        "enable_slack": settings.SLACK_ENABLED is True,
         "enable_slack_btn": settings.SLACK_CLIENT_ID is not None,
         "enable_sms": settings.TWILIO_AUTH is not None,
         "enable_telegram": settings.TELEGRAM_TOKEN is not None,
@@ -1112,6 +1114,7 @@ def add_pagertree(request, code):
     return render(request, "integrations/add_pagertree.html", ctx)
 
 
+@require_setting("SLACK_ENABLED")
 @login_required
 def add_slack(request, code):
     project = _get_rw_project_for_user(request, code)
@@ -1136,12 +1139,14 @@ def add_slack(request, code):
     return render(request, "integrations/add_slack.html", ctx)
 
 
+@require_setting("SLACK_ENABLED")
 @require_setting("SLACK_CLIENT_ID")
 def slack_help(request):
     ctx = {"page": "channels"}
     return render(request, "integrations/add_slack_btn.html", ctx)
 
 
+@require_setting("SLACK_ENABLED")
 @require_setting("SLACK_CLIENT_ID")
 @login_required
 def add_slack_btn(request, code):
@@ -1166,6 +1171,7 @@ def add_slack_btn(request, code):
     return render(request, "integrations/add_slack_btn.html", ctx)
 
 
+@require_setting("SLACK_ENABLED")
 @require_setting("SLACK_CLIENT_ID")
 @login_required
 def add_slack_complete(request):
diff --git a/hc/settings.py b/hc/settings.py
index 66f01388..4d053aba 100644
--- a/hc/settings.py
+++ b/hc/settings.py
@@ -221,6 +221,7 @@ SIGNAL_CLI_ENABLED = envbool("SIGNAL_CLI_ENABLED", "False")
 # Slack integration
 SLACK_CLIENT_ID = os.getenv("SLACK_CLIENT_ID")
 SLACK_CLIENT_SECRET = os.getenv("SLACK_CLIENT_SECRET")
+SLACK_ENABLED = envbool("SLACK_ENABLED", "True")
 
 # Telegram integration -- override in local_settings.py
 TELEGRAM_BOT_NAME = os.getenv("TELEGRAM_BOT_NAME", "ExampleBot")
diff --git a/templates/docs/self_hosted_configuration.html b/templates/docs/self_hosted_configuration.html
index 0b240f63..c8249f85 100644
--- a/templates/docs/self_hosted_configuration.html
+++ b/templates/docs/self_hosted_configuration.html
@@ -267,10 +267,14 @@ its web UI and documentation.</p>
 it needs to construct absolute URLs.</p>
 <h2 id="SLACK_CLIENT_ID"><code>SLACK_CLIENT_ID</code></h2>
 <p>Default: <code>None</code></p>
-<p>The Slack Client ID, required by the Slack integration.</p>
-<p>Go to <a href="https://api.slack.com/apps/">https://api.slack.com/apps/</a>
-to create a <em>Slack app</em>, and look up its <em>Client ID</em> and <em>Client Secret</em>.</p>
-<p>When setting up the Slack app, make sure to:</p>
+<p>The Slack Client ID, used by the Slack integration.</p>
+<p>The Slack integration can work with or without the Slack Client ID. If
+the Slack Client ID is not set, in the "Integrations - Add Slack" page,
+Healthchecks will ask the user to provide a webhook URL for posting notifications.</p>
+<p>If the Slack Client <em>is</em> set, Healthchecks will use the OAuth2 flow
+to get the webhook URL from Slack. The OAuth2 flow is more user-friendly.
+To set it up, go to <a href="https://api.slack.com/apps/">https://api.slack.com/apps/</a>
+and create a <em>Slack app</em>. When setting up the Slack app, make sure to:</p>
 <ul>
 <li>Add the <a href="https://api.slack.com/scopes/incoming-webhook">incoming-webhook</a>
   scope to the Bot Token Scopes.</li>
@@ -280,8 +284,11 @@ to create a <em>Slack app</em>, and look up its <em>Client ID</em> and <em>Clien
 </ul>
 <h2 id="SLACK_CLIENT_SECRET"><code>SLACK_CLIENT_SECRET</code></h2>
 <p>Default: <code>None</code></p>
-<p>The Slack Client Secret, required by the Slack integration.
+<p>The Slack Client Secret, required if <code>SLACK_CLIENT_ID</code> is set.
 Look it up at <a href="https://api.slack.com/apps/">https://api.slack.com/apps/</a>.</p>
+<h2 id="SLACK_ENABLED"><code>SLACK_ENABLED</code></h2>
+<p>Default: <code>True</code></p>
+<p>A boolean that turns on/off the Slack integration. Enabled by default.</p>
 <h2 id="TELEGRAM_BOT_NAME"><code>TELEGRAM_BOT_NAME</code></h2>
 <p>Default: <code>ExampleBot</code></p>
 <p>The <a href="https://telegram.org/">Telegram</a> bot name, required by the Telegram integration.</p>
diff --git a/templates/docs/self_hosted_configuration.md b/templates/docs/self_hosted_configuration.md
index 5aab1258..722e6d43 100644
--- a/templates/docs/self_hosted_configuration.md
+++ b/templates/docs/self_hosted_configuration.md
@@ -427,12 +427,16 @@ it needs to construct absolute URLs.
 
 Default: `None`
 
-The Slack Client ID, required by the Slack integration.
+The Slack Client ID, used by the Slack integration.
 
-Go to [https://api.slack.com/apps/](https://api.slack.com/apps/)
-to create a _Slack app_, and look up its _Client ID_ and _Client Secret_.
+The Slack integration can work with or without the Slack Client ID. If
+the Slack Client ID is not set, in the "Integrations - Add Slack" page,
+Healthchecks will ask the user to provide a webhook URL for posting notifications.
 
-When setting up the Slack app, make sure to:
+If the Slack Client _is_ set, Healthchecks will use the OAuth2 flow
+to get the webhook URL from Slack. The OAuth2 flow is more user-friendly.
+To set it up, go to [https://api.slack.com/apps/](https://api.slack.com/apps/)
+and create a _Slack app_. When setting up the Slack app, make sure to:
 
 * Add the [incoming-webhook](https://api.slack.com/scopes/incoming-webhook)
   scope to the Bot Token Scopes.
@@ -444,9 +448,15 @@ When setting up the Slack app, make sure to:
 
 Default: `None`
 
-The Slack Client Secret, required by the Slack integration.
+The Slack Client Secret. Required if `SLACK_CLIENT_ID` is set.
 Look it up at [https://api.slack.com/apps/](https://api.slack.com/apps/).
 
+## `SLACK_ENABLED` {: #SLACK_ENABLED }
+
+Default: `True`
+
+A boolean that turns on/off the Slack integration. Enabled by default.
+
 ## `TELEGRAM_BOT_NAME` {: #TELEGRAM_BOT_NAME }
 
 Default: `ExampleBot`
diff --git a/templates/front/channels.html b/templates/front/channels.html
index 54e25421..b3497a94 100644
--- a/templates/front/channels.html
+++ b/templates/front/channels.html
@@ -186,6 +186,7 @@
     {% if rw %}
     <h1 class="ai-title">Add More</h1>
     <ul class="add-integration">
+        {% if enable_slack %}
         <li>
             <img src="{% static 'img/integrations/slack.png' %}"
                 class="icon" alt="Slack icon" />
@@ -198,6 +199,8 @@
             <a href="{% url 'hc-add-slack' project.code %}" class="btn btn-primary">Add Integration</a>
             {% endif %}
         </li>
+        {% endif %}
+
         <li>
             <img src="{% static 'img/integrations/email.png' %}"
                 class="icon" alt="Email icon" />
diff --git a/templates/front/welcome.html b/templates/front/welcome.html
index 9e76c7ea..ea3f5cbb 100644
--- a/templates/front/welcome.html
+++ b/templates/front/welcome.html
@@ -393,6 +393,7 @@
         </div>
         {% endif %}
 
+        {% if enable_slack %}
         <div class="col-lg-2 col-md-3 col-sm-4 col-xs-6">
             {% if enable_slack_btn %}
             <a href="{% url 'hc-slack-help' %}" class="integration">
@@ -412,6 +413,7 @@
             </div>
             {% endif %}
         </div>
+        {% endif %}
 
         {% if enable_apprise %}
         <div class="col-lg-2 col-md-3 col-sm-4 col-xs-6">
diff --git a/templates/integrations/add_slack.html b/templates/integrations/add_slack.html
index 07c9ce43..93285fa9 100644
--- a/templates/integrations/add_slack.html
+++ b/templates/integrations/add_slack.html
@@ -40,7 +40,7 @@
     <div class="row ai-step">
         <div class="col-sm-6">
             <span class="step-no"></span>
-            <p>Copy the displayed <strong>WebHook URL</strong> and paste it down below.</p>
+            <p>Copy the displayed <strong>Webhook URL</strong> and paste it down below.</p>
             <p>Save the integration, and it's done!</p>
         </div>
         <div class="col-sm-6">
@@ -57,7 +57,7 @@
         {% csrf_token %}
         <div class="form-group {{ form.value.css_classes }}">
             <label for="callback-url" class="col-sm-2 control-label">
-                Callback URL
+                Webhook URL
             </label>
             <div class="col-sm-10">
                 <input