diff --git a/src/corelib/thread/qmutex.cpp b/src/corelib/thread/qmutex.cpp
index ba97ef8a42..dec0a95c47 100644
--- a/src/corelib/thread/qmutex.cpp
+++ b/src/corelib/thread/qmutex.cpp
@@ -494,6 +494,14 @@ void QRecursiveMutex::unlock() noexcept
     \sa QMutex::unlock()
 */
 
+/*!
+    \fn template <typename Mutex> bool QMutexLocker<Mutex>::isLocked() const noexcept
+    \since 6.4
+
+    Returns true if this QMutexLocker is currently locking its associated
+    mutex, or false otherwise.
+*/
+
 /*!
     \fn template <typename Mutex> void QMutexLocker<Mutex>::unlock() noexcept
 
diff --git a/src/corelib/thread/qmutex.h b/src/corelib/thread/qmutex.h
index fea3657150..f57a95de22 100644
--- a/src/corelib/thread/qmutex.h
+++ b/src/corelib/thread/qmutex.h
@@ -252,6 +252,11 @@ public:
         unlock();
     }
 
+    inline bool isLocked() const noexcept
+    {
+        return m_isLocked;
+    }
+
     inline void unlock() noexcept
     {
         if (!m_isLocked)
diff --git a/tests/auto/corelib/thread/qmutexlocker/tst_qmutexlocker.cpp b/tests/auto/corelib/thread/qmutexlocker/tst_qmutexlocker.cpp
index d873291fd6..29c8b92222 100644
--- a/tests/auto/corelib/thread/qmutexlocker/tst_qmutexlocker.cpp
+++ b/tests/auto/corelib/thread/qmutexlocker/tst_qmutexlocker.cpp
@@ -80,6 +80,7 @@ void tst_QMutexLocker::scopeTest()
 
             {
                 QMutexLocker locker(&mutex);
+                QVERIFY(locker.isLocked());
                 waitForTest();
             }
 
@@ -122,16 +123,23 @@ void tst_QMutexLocker::unlockAndRelockTest()
         void run() override
         {
             QMutexLocker locker(&mutex);
+            QVERIFY(locker.isLocked());
 
             waitForTest();
 
+            QVERIFY(locker.isLocked());
             locker.unlock();
+            QVERIFY(!locker.isLocked());
 
             waitForTest();
 
+            QVERIFY(!locker.isLocked());
             locker.relock();
+            QVERIFY(locker.isLocked());
 
             waitForTest();
+
+            QVERIFY(locker.isLocked());
         }
     };
 
@@ -169,10 +177,16 @@ void tst_QMutexLocker::lockerStateTest()
         {
             {
                 QMutexLocker locker(&mutex);
+                QVERIFY(locker.isLocked());
+
                 locker.relock();
+                QVERIFY(locker.isLocked());
+
                 locker.unlock();
+                QVERIFY(!locker.isLocked());
 
                 waitForTest();
+                QVERIFY(!locker.isLocked());
             }
 
             waitForTest();