diff --git a/DOCUMENTATION.md b/DOCUMENTATION.md
index 858bb944..43bba942 100644
--- a/DOCUMENTATION.md
+++ b/DOCUMENTATION.md
@@ -1360,6 +1360,22 @@ Endpoint URL for the OAuth2 token
 
 Default: (unset)
 
+##### oauth2_client_id
+
+_(>= 3.7.0)_
+
+Client ID used to request the Auth2 token
+
+Default: `radicale`
+
+##### oauth2_client_secret
+
+_(>= 3.7.0)_
+
+Client secret used to request the Auth2 token
+
+Default: (unset)
+
 ##### pam_service
 
 _(>= 3.5.0)_
diff --git a/config b/config
index 0c5b90a6..18e29a1f 100644
--- a/config
+++ b/config
@@ -156,6 +156,12 @@
 # OAuth2 token endpoint URL
 #oauth2_token_endpoint = <URL>
 
+# OAuth2 client id
+#oauth2_client_id = radicale
+
+# OAuth2 client secret (optional)
+#oauth2_client_secret =
+
 # PAM service
 #pam_serivce = radicale
 
diff --git a/radicale/auth/oauth2.py b/radicale/auth/oauth2.py
index 838a786e..87592d0b 100644
--- a/radicale/auth/oauth2.py
+++ b/radicale/auth/oauth2.py
@@ -34,6 +34,8 @@ class Auth(auth.BaseAuth):
     def __init__(self, configuration):
         super().__init__(configuration)
         self._endpoint = configuration.get("auth", "oauth2_token_endpoint")
+        self._client_id = configuration.get("auth", "oauth2_client_id")
+        self._client_secret = configuration.get("auth", "oauth2_client_secret")
         if not self._endpoint:
             logger.error("auth.oauth2_token_endpoint URL missing")
             raise RuntimeError("OAuth2 token endpoint URL is required")
@@ -49,8 +51,11 @@ class Auth(auth.BaseAuth):
                 "username": login,
                 "password": password,
                 "grant_type": "password",
-                "client_id": "radicale",
+                "client_id": self._client_id,
             }
+            if self._client_secret:
+                req_params["client_secret"] = self._client_secret
+
             req_headers = {"Content-Type": "application/x-www-form-urlencoded"}
             response = requests.post(
                 self._endpoint, data=req_params, headers=req_headers
diff --git a/radicale/config.py b/radicale/config.py
index bdca5526..6cc0460d 100644
--- a/radicale/config.py
+++ b/radicale/config.py
@@ -354,6 +354,14 @@ DEFAULT_CONFIG_SCHEMA: types.CONFIG_SCHEMA = OrderedDict([
             "value": "",
             "help": "OAuth2 token endpoint URL",
             "type": str}),
+        ("oauth2_client_id", {
+            "value": "radicale",
+            "help": "OAuth2 client id",
+            "type": str}),
+        ("oauth2_client_secret", {
+            "value": "",
+            "help": "OAuth2 client secret",
+            "type": str}),
         ("pam_group_membership", {
             "value": "",
             "help": "PAM group user should be member of",