diff --git a/fastapi/dependencies.py b/fastapi/dependencies.py
index 4a62ab58..4835c74c 100644
--- a/fastapi/dependencies.py
+++ b/fastapi/dependencies.py
@@ -43,6 +43,12 @@ def authenticated_partner_impl() -> Partner:
     See the fastapi_endpoint_demo for an example"""
 
 
+def optionally_authenticated_partner_impl() -> Partner | None:
+    """This method has to be overriden when you create your fastapi app
+    and you need to get an optional authenticated partner into your endpoint.
+    """
+
+
 def authenticated_partner_env(
     partner: Annotated[Partner, Depends(authenticated_partner_impl)]
 ) -> Environment:
@@ -50,6 +56,18 @@ def authenticated_partner_env(
     return partner.with_context(authenticated_partner_id=partner.id).env
 
 
+def optionally_authenticated_partner_env(
+    partner: Annotated[Partner | None, Depends(optionally_authenticated_partner_impl)],
+    env: Annotated[Environment, Depends(odoo_env)],
+) -> Environment:
+    """Return an environment with the authenticated partner id in the context if
+    the partner is not None
+    """
+    if partner:
+        return partner.with_context(authenticated_partner_id=partner.id).env
+    return env
+
+
 def authenticated_partner(
     partner: Annotated[Partner, Depends(authenticated_partner_impl)],
     partner_env: Annotated[Environment, Depends(authenticated_partner_env)],
@@ -66,6 +84,22 @@ def authenticated_partner(
     return partner_env["res.partner"].browse(partner.id)
 
 
+def optionally_authenticated_partner(
+    partner: Annotated[Partner | None, Depends(optionally_authenticated_partner_impl)],
+    partner_env: Annotated[Environment, Depends(optionally_authenticated_partner_env)],
+) -> Partner | None:
+    """If you need to get access to the authenticated partner if the call is
+    authenticated, you can add a dependency into the endpoint definition on this
+    method.
+
+    This method defer from authenticated_partner by the fact that it returns
+    None if the partner is not authenticated .
+    """
+    if partner:
+        return partner_env["res.partner"].browse(partner.id)
+    return None
+
+
 def paging(
     page: Annotated[int, Query(gte=1)] = 1, page_size: Annotated[int, Query(gte=1)] = 80
 ) -> Paging:
diff --git a/fastapi/tests/common.py b/fastapi/tests/common.py
index 33e7581b..2ae0dcf4 100644
--- a/fastapi/tests/common.py
+++ b/fastapi/tests/common.py
@@ -15,7 +15,10 @@
 from fastapi.testclient import TestClient
 
 from ..context import odoo_env_ctx
-from ..dependencies import authenticated_partner_impl
+from ..dependencies import (
+    authenticated_partner_impl,
+    optionally_authenticated_partner_impl,
+)
 
 
 @tagged("post_install", "-at_install")
@@ -106,6 +109,15 @@ def _create_test_client(
             )
         if partner or authenticated_partner_impl not in dependencies:
             dependencies[authenticated_partner_impl] = partial(lambda a: a, partner)
+        if partner and optionally_authenticated_partner_impl in dependencies:
+            raise ValueError(
+                "You cannot provide an override for the optionally_authenticated_partner_impl "
+                "dependency when creating a test client with a partner."
+            )
+        if partner or optionally_authenticated_partner_impl not in dependencies:
+            dependencies[optionally_authenticated_partner_impl] = partial(
+                lambda a: a, partner
+            )
         app = app or self.default_fastapi_app or FastAPI()
         router = router or self.default_fastapi_router
         if router: