diff --git a/tableauserverclient/server/endpoint/workbooks_endpoint.py b/tableauserverclient/server/endpoint/workbooks_endpoint.py
index 5f9695829..218a4016f 100644
--- a/tableauserverclient/server/endpoint/workbooks_endpoint.py
+++ b/tableauserverclient/server/endpoint/workbooks_endpoint.py
@@ -14,6 +14,7 @@
 from tableauserverclient.server.endpoint.exceptions import (
     InternalServerError,
     MissingRequiredFieldError,
+    ServerResponseError,
     UnsupportedAttributeError,
 )
 from tableauserverclient.server.endpoint.permissions_endpoint import _PermissionsEndpoint
@@ -125,7 +126,7 @@ def get_by_id(self, workbook_id: str) -> WorkbookItem:
         return WorkbookItem.from_response(server_response.content, self.parent_srv.namespace)[0]
 
     @api(version="2.8")
-    def refresh(self, workbook_item: Union[WorkbookItem, str], incremental: bool = False) -> JobItem:
+    def refresh(self, workbook_item: Union[WorkbookItem, str], incremental: bool = False) -> JobItem | None:
         """
         Refreshes the extract of an existing workbook.
 
@@ -138,13 +139,19 @@ def refresh(self, workbook_item: Union[WorkbookItem, str], incremental: bool = F
 
         Returns
         -------
-        JobItem
-            The job item.
+        JobItem | None
+            The job item, or None if a refresh job is already queued for this workbook.
         """
         id_ = getattr(workbook_item, "id", workbook_item)
         url = f"{self.baseurl}/{id_}/refresh"
         refresh_req = RequestFactory.Task.refresh_req(incremental, self.parent_srv)
-        server_response = self.post_request(url, refresh_req)
+        try:
+            server_response = self.post_request(url, refresh_req)
+        except ServerResponseError as e:
+            if e.code.startswith("409") and "already" in e.detail:
+                logger.warning(f"{e.summary} {e.detail}")
+                return None
+            raise
         new_job = JobItem.from_response(server_response.content, self.parent_srv.namespace)[0]
         return new_job
 
diff --git a/test/assets/workbook_refresh_duplicate.xml b/test/assets/workbook_refresh_duplicate.xml
new file mode 100644
index 000000000..eca4b4bcc
--- /dev/null
+++ b/test/assets/workbook_refresh_duplicate.xml
@@ -0,0 +1,3 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<tsResponse xmlns="http://tableau.com/api" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tableau.com/api https://help.tableau.com/samples/en-us/rest_api/ts-api_3_27.xsd">
+<error code="409093"><summary>Resource Conflict</summary><detail>Job for \'extract\' is already queued. Not queuing a duplicate.</detail></error></tsResponse>
\ No newline at end of file
diff --git a/test/test_workbook.py b/test/test_workbook.py
index e6e807f89..b210e8402 100644
--- a/test/test_workbook.py
+++ b/test/test_workbook.py
@@ -34,6 +34,7 @@
 PUBLISH_XML = TEST_ASSET_DIR / "workbook_publish.xml"
 PUBLISH_ASYNC_XML = TEST_ASSET_DIR / "workbook_publish_async.xml"
 REFRESH_XML = TEST_ASSET_DIR / "workbook_refresh.xml"
+WORKBOOK_REFRESH_DUPLICATE_XML = TEST_ASSET_DIR / "workbook_refresh_duplicate.xml"
 REVISION_XML = TEST_ASSET_DIR / "workbook_revision.xml"
 UPDATE_XML = TEST_ASSET_DIR / "workbook_update.xml"
 UPDATE_PERMISSIONS = TEST_ASSET_DIR / "workbook_update_permissions.xml"
@@ -178,6 +179,20 @@ def test_refresh_id(server: TSC.Server) -> None:
         server.workbooks.refresh("3cc6cd06-89ce-4fdc-b935-5294135d6d42")
 
 
+def test_refresh_already_running(server: TSC.Server) -> None:
+    server.version = "2.8"
+    server.workbooks.baseurl
+    response_xml = WORKBOOK_REFRESH_DUPLICATE_XML.read_text()
+    with requests_mock.mock() as m:
+        m.post(
+            server.workbooks.baseurl + "/3cc6cd06-89ce-4fdc-b935-5294135d6d42/refresh",
+            status_code=409,
+            text=response_xml,
+        )
+        refresh_job = server.workbooks.refresh("3cc6cd06-89ce-4fdc-b935-5294135d6d42")
+        assert refresh_job is None
+
+
 def test_refresh_object(server: TSC.Server) -> None:
     server.version = "2.8"
     server.workbooks.baseurl