diff --git a/changelog.d/7644.misc b/changelog.d/7644.misc
new file mode 100644
index 0000000000000000000000000000000000000000..0f45141bcc9883b6ab1e11f053cc548ff9ed2628
--- /dev/null
+++ b/changelog.d/7644.misc
@@ -0,0 +1 @@
+Remove some unused constants.
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index bcaf2c3600e41f7d95db24f09436b576f9b08723..d323b0b9b36546c1b501022eb70b4dfd9f6b17c5 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -64,10 +64,6 @@ class LoginType(object):
     SSO = "org.matrix.login.sso"
     DUMMY = "m.login.dummy"
 
-    # Only for C/S API v1
-    APPLICATION_SERVICE = "m.login.application_service"
-    SHARED_SECRET = "org.matrix.login.shared_secret"
-
 
 class EventTypes(object):
     Member = "m.room.member"