diff --git a/src/sentry_plugins/slack/plugin.py b/src/sentry_plugins/slack/plugin.py
index f329d6e6e976a9..8c08c79e8fcd78 100644
--- a/src/sentry_plugins/slack/plugin.py
+++ b/src/sentry_plugins/slack/plugin.py
@@ -24,6 +24,8 @@
     status.HTTP_429_TOO_MANY_REQUESTS,
 ]
 
+SLACK_PLUGIN_TITLE_LENGTH_LIMIT = 256
+
 
 class SlackPlugin(CorePluginMixin, notify.NotificationPlugin):
     title = "Slack"
@@ -166,7 +168,7 @@ def notify(self, notification: Notification, raise_exception: bool = False) -> N
         if not self.is_configured(project):
             return
 
-        title = event.title.encode("utf-8")
+        title = event.title[:SLACK_PLUGIN_TITLE_LENGTH_LIMIT].encode("utf-8")
         # TODO(dcramer): we'd like this to be the event culprit, but Sentry
         # does not currently retain it
         if group.culprit: