diff --git a/changelog.d/12723.misc b/changelog.d/12723.misc
new file mode 100644
index 0000000000000000000000000000000000000000..4f5bffeda639e8d17156a61ff8c07cc53d7a4a49
--- /dev/null
+++ b/changelog.d/12723.misc
@@ -0,0 +1 @@
+Downgrade some OIDC errors to warnings in the logs, to reduce the noise of Sentry reports.
diff --git a/synapse/handlers/oidc.py b/synapse/handlers/oidc.py
index f6ffb7d18d910c6d62c67405a737098694ad97e8..9de61d554f41ec340e6564671602fd454f4b5549 100644
--- a/synapse/handlers/oidc.py
+++ b/synapse/handlers/oidc.py
@@ -224,7 +224,7 @@ class OidcHandler:
             self._sso_handler.render_error(request, "invalid_session", str(e))
             return
         except MacaroonInvalidSignatureException as e:
-            logger.exception("Could not verify session for OIDC callback")
+            logger.warning("Could not verify session for OIDC callback: %s", e)
             self._sso_handler.render_error(request, "mismatching_session", str(e))
             return
 
@@ -827,7 +827,7 @@ class OidcProvider:
             logger.debug("Exchanging OAuth2 code for a token")
             token = await self._exchange_code(code)
         except OidcError as e:
-            logger.exception("Could not exchange OAuth2 code")
+            logger.warning("Could not exchange OAuth2 code: %s", e)
             self._sso_handler.render_error(request, e.error, e.error_description)
             return