diff --git a/src/corelib/thread/qthread.cpp b/src/corelib/thread/qthread.cpp
index ea76a2ccada..738c3846c53 100644
--- a/src/corelib/thread/qthread.cpp
+++ b/src/corelib/thread/qthread.cpp
@@ -438,7 +438,7 @@ QThread *QThread::currentThread()
 
     \sa currentThread(), QCoreApplication::instance()
 */
-bool QThread::isMainThread()
+bool QThread::isMainThread() noexcept
 {
     return currentThreadId() == QCoreApplicationPrivate::theMainThreadId.loadRelaxed();
 }
@@ -952,7 +952,7 @@ int QThread::loopLevel() const
     therefore give surprising results if it outlives the QThread object
     (threads claimed to be the same even if they aren't).
 */
-Qt::HANDLE QThreadPrivate::threadId() const
+Qt::HANDLE QThreadPrivate::threadId() const noexcept
 {
     return data->threadId.loadRelaxed();
 }
@@ -963,7 +963,7 @@ Qt::HANDLE QThreadPrivate::threadId() const
 
     \sa currentThreadId()
 */
-bool QThread::isCurrentThread() const
+bool QThread::isCurrentThread() const noexcept
 {
     Q_D(const QThread);
     return QThread::currentThreadId() == d->threadId();
@@ -1041,7 +1041,7 @@ QThread *QThread::currentThread()
     return QThreadData::current()->thread.loadAcquire();
 }
 
-bool QThread::isCurrentThread() const
+bool QThread::isCurrentThread() const noexcept
 {
     return true;
 }
diff --git a/src/corelib/thread/qthread.h b/src/corelib/thread/qthread.h
index 641c8ef68a0..ae060ecf1cf 100644
--- a/src/corelib/thread/qthread.h
+++ b/src/corelib/thread/qthread.h
@@ -30,7 +30,7 @@ class Q_CORE_EXPORT QThread : public QObject
 public:
     static Qt::HANDLE currentThreadId() noexcept Q_DECL_PURE_FUNCTION;
     static QThread *currentThread();
-    static bool isMainThread();
+    static bool isMainThread() noexcept;
     static int idealThreadCount() noexcept;
     static void yieldCurrentThread();
 
@@ -69,7 +69,7 @@ public:
     bool event(QEvent *event) override;
     int loopLevel() const;
 
-    bool isCurrentThread() const;
+    bool isCurrentThread() const noexcept;
 
     template <typename Function, typename... Args>
     [[nodiscard]] static QThread *create(Function &&f, Args &&... args);
diff --git a/src/corelib/thread/qthread_p.h b/src/corelib/thread/qthread_p.h
index c39e21ec9a2..d6fd99e5ba2 100644
--- a/src/corelib/thread/qthread_p.h
+++ b/src/corelib/thread/qthread_p.h
@@ -179,7 +179,7 @@ public:
     ~QThreadPrivate();
 
     void setPriority(QThread::Priority prio);
-    Qt::HANDLE threadId() const;
+    Qt::HANDLE threadId() const noexcept;
 
     mutable QMutex mutex;
     QAtomicInt quitLockRef;