diff --git a/tensorrt_llm/serve/openai_protocol.py b/tensorrt_llm/serve/openai_protocol.py
index 1c0918fe370e..de1d6ea29d47 100644
--- a/tensorrt_llm/serve/openai_protocol.py
+++ b/tensorrt_llm/serve/openai_protocol.py
@@ -435,6 +435,15 @@ class CompletionRequest(OpenAIBaseModel):
             "The time interval in milliseconds to create responses under the streaming mode. "
             "If not set, the engine-level default is used."),
     )
+    priority: Optional[float] = Field(
+        default=None,
+        ge=0.0,
+        le=1.0,
+        description=(
+            "Scheduling priority in [0.0, 1.0]; higher is served first. Only honored "
+            "when the engine runs with scheduler_config.waiting_queue_policy=priority. "
+            "If unset, the engine default (0.5) is used."),
+    )
 
     # doc: end-completion-extra-params
 
@@ -828,6 +837,15 @@ class ChatCompletionRequest(OpenAIBaseModel):
             "The time interval in milliseconds to create responses under the streaming mode. "
             "If not set, the engine-level default is used."),
     )
+    priority: Optional[float] = Field(
+        default=None,
+        ge=0.0,
+        le=1.0,
+        description=(
+            "Scheduling priority in [0.0, 1.0]; higher is served first. Only honored "
+            "when the engine runs with scheduler_config.waiting_queue_policy=priority. "
+            "If unset, the engine default (0.5) is used."),
+    )
 
     agent_hierarchy: Optional[AgentHierarchy] = Field(
         default=None, description="Agent hierarchy ")
diff --git a/tensorrt_llm/serve/openai_server.py b/tensorrt_llm/serve/openai_server.py
index f1a9a012de29..c82464b06d4c 100644
--- a/tensorrt_llm/serve/openai_server.py
+++ b/tensorrt_llm/serve/openai_server.py
@@ -1597,6 +1597,7 @@ async def chat_stream_generator(
                 cache_salt=request.cache_salt,
                 trace_headers=trace_headers,
                 scheduling_params=scheduling_params,
+                priority=request.priority if request.priority is not None else 0.5,
             )
             if not self.postproc_worker_enabled:
                 postproc_args.tokenizer = self.tokenizer
@@ -1921,7 +1922,8 @@ async def generator_wrapper(generator: AsyncIterator[Any]):
                     streaming=request.stream,
                     lora_request=request.lora_request,
                     disaggregated_params=disaggregated_params,
-                    trace_headers=trace_headers
+                    trace_headers=trace_headers,
+                    priority=request.priority if request.priority is not None else 0.5,
                 )
                 if not self.postproc_worker_enabled:
                     postproc_args.tokenizer = self.tokenizer