diff --git a/src/flask/app.py b/src/flask/app.py
index 34d315da..3278ae9a 100644
--- a/src/flask/app.py
+++ b/src/flask/app.py
@@ -478,7 +478,7 @@ class Flask(App):
         for name in names:
             if name in self.template_context_processors:
                 for func in self.template_context_processors[name]:
-                    context.update(func())
+                    context.update(self.ensure_sync(func)())
 
         context.update(orig_ctx)
 
diff --git a/src/flask/typing.py b/src/flask/typing.py
index 50aef7f4..0cd4b3e7 100644
--- a/src/flask/typing.py
+++ b/src/flask/typing.py
@@ -61,7 +61,10 @@ TeardownCallable = t.Union[
     t.Callable[[t.Optional[BaseException]], None],
     t.Callable[[t.Optional[BaseException]], t.Awaitable[None]],
 ]
-TemplateContextProcessorCallable = t.Callable[[], t.Dict[str, t.Any]]
+TemplateContextProcessorCallable = t.Union[
+    t.Callable[[], t.Dict[str, t.Any]],
+    t.Callable[[], t.Awaitable[t.Dict[str, t.Any]]],
+]
 TemplateFilterCallable = t.Callable[..., t.Any]
 TemplateGlobalCallable = t.Callable[..., t.Any]
 TemplateTestCallable = t.Callable[..., bool]