diff --git a/gitlab/exceptions.py b/gitlab/exceptions.py
index 3fb0613e5..c5934af5f 100644
--- a/gitlab/exceptions.py
+++ b/gitlab/exceptions.py
@@ -111,6 +111,10 @@ class GitlabMROnBuildSuccessError(GitlabOperationError):
     pass
 
 
+class GitlabServiceSlackError(GitlabOperationError):
+    pass
+
+
 def raise_error_from_response(response, error, expected_code=200):
     """Tries to parse gitlab error message from response and raises error.
 
diff --git a/gitlab/objects.py b/gitlab/objects.py
index 42d5b38ee..bcb842c19 100644
--- a/gitlab/objects.py
+++ b/gitlab/objects.py
@@ -2067,6 +2067,19 @@ def share(self, group_id, group_access, **kwargs):
         r = self.gitlab._raw_post(url, data=data, **kwargs)
         raise_error_from_response(r, GitlabCreateError, 201)
 
+    def slack_service(self, webhook, username=None, channel=None, **kwargs):
+        url = "/projects/%s/services/slack" % self.id
+        r = self.gitlab._raw_put(
+            url,
+            data={
+                'webhook': webhook,
+                'username': username,
+                'channel': channel
+            },
+            **kwargs
+        )
+        raise_error_from_response(r, GitlabServiceSlackError)
+
 
 class Runner(GitlabObject):
     _url = '/runners'