diff --git a/include/asio/detail/impl/io_uring_service.ipp b/include/asio/detail/impl/io_uring_service.ipp
index c43b65d7e8..b249195f98 100644
--- a/include/asio/detail/impl/io_uring_service.ipp
+++ b/include/asio/detail/impl/io_uring_service.ipp
@@ -538,6 +538,14 @@ void io_uring_service::init_ring()
     asio::detail::throw_error(ec, "io_uring_queue_init");
   }
 
+#if defined(ASIO_DISABLE_IO_URING_IOWAIT)
+# if !defined(IORING_FEAT_NO_IOWAIT)
+#  error ASIO_DISABLE_IO_URING_IOWAIT requires liburing 2.12 or later
+# endif // !defined(IORING_FEAT_NO_IOWAIT)
+  // Opt out of io_uring's in_iowait task marking.
+  (void)::io_uring_set_iowait(&ring_, false);
+#endif // defined(ASIO_DISABLE_IO_URING_IOWAIT)
+
 #if !defined(ASIO_HAS_IO_URING_AS_DEFAULT)
   event_fd_ = ::eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
   if (event_fd_ < 0)
diff --git a/src/doc/platform_macros.qbk b/src/doc/platform_macros.qbk
index 8e7f171bf1..ae275518ad 100644
--- a/src/doc/platform_macros.qbk
+++ b/src/doc/platform_macros.qbk
@@ -268,6 +268,13 @@ needs.
     ]
     []
   ]
+  [
+    [`ASIO_DISABLE_IO_URING_IOWAIT`]
+    [
+      Linux: suppress io_uring's `in_iowait` task marking.
+    ]
+    []
+  ]
   [
     [`ASIO_HAS_KQUEUE`]
     [
diff --git a/src/doc/using.qbk b/src/doc/using.qbk
index 08897fc55f..73a8651b8d 100644
--- a/src/doc/using.qbk
+++ b/src/doc/using.qbk
@@ -260,6 +260,13 @@ functionality, and behaviour of Asio.
       pipe to interrupt blocked epoll/select system calls.
     ]
   ]
+  [
+    [`ASIO_DISABLE_IO_URING_IOWAIT`]
+    [
+      Suppresses io_uring's `in_iowait` task marking on Linux via
+      `io_uring_set_iowait()`.
+    ]
+  ]
   [
     [`ASIO_DISABLE_KQUEUE`]
     [