diff --git a/src/corelib/global/qlogging.cpp b/src/corelib/global/qlogging.cpp
index 5c17679fb1..bfb2535448 100644
--- a/src/corelib/global/qlogging.cpp
+++ b/src/corelib/global/qlogging.cpp
@@ -1487,12 +1487,6 @@ QString qFormatLogMessage(QtMsgType type, const QMessageLogContext &context, con
     return message;
 }
 
-#if !QT_DEPRECATED_SINCE(5, 0)
-// make sure they're defined to be exported
-typedef void (*QtMsgHandler)(QtMsgType, const char *);
-Q_CORE_EXPORT QtMsgHandler qInstallMsgHandler(QtMsgHandler);
-#endif
-
 static void qDefaultMsgHandler(QtMsgType type, const char *buf);
 static void qDefaultMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &buf);
 
@@ -1960,7 +1954,7 @@ void qErrnoWarning(int code, const char *msg, ...)
     \snippet code/src_corelib_global_qglobal.cpp 7
 
     This typedef is deprecated, you should use QtMessageHandler instead.
-    \sa QtMsgType, QtMessageHandler, qInstallMsgHandler(), qInstallMessageHandler()
+    \sa QtMsgType, QtMessageHandler, qInstallMessageHandler()
 */
 
 /*!
@@ -2010,16 +2004,6 @@ void qErrnoWarning(int code, const char *msg, ...)
     {Debugging Techniques}
 */
 
-/*!
-    \fn QtMsgHandler qInstallMsgHandler(QtMsgHandler handler)
-    \relates <QtGlobal>
-    \deprecated
-
-    Installs a Qt message \a handler which has been defined
-    previously. This method is deprecated, use qInstallMessageHandler
-    instead.
-    \sa QtMsgHandler, qInstallMessageHandler()
-*/
 /*!
     \fn void qSetMessagePattern(const QString &pattern)
     \relates <QtGlobal>
@@ -2096,15 +2080,6 @@ QtMessageHandler qInstallMessageHandler(QtMessageHandler h)
         return qDefaultMessageHandler;
 }
 
-QtMsgHandler qInstallMsgHandler(QtMsgHandler h)
-{
-    const auto old = msgHandler.fetchAndStoreOrdered(h);
-    if (old)
-        return old;
-    else
-        return qDefaultMsgHandler;
-}
-
 void qSetMessagePattern(const QString &pattern)
 {
     const auto locker = qt_scoped_lock(QMessagePattern::mutex);
diff --git a/src/corelib/global/qlogging.h b/src/corelib/global/qlogging.h
index 4a528a2973..be9707ff06 100644
--- a/src/corelib/global/qlogging.h
+++ b/src/corelib/global/qlogging.h
@@ -188,11 +188,6 @@ Q_CORE_EXPORT void qt_message_output(QtMsgType, const QMessageLogContext &contex
 Q_CORE_EXPORT Q_DECL_COLD_FUNCTION void qErrnoWarning(int code, const char *msg, ...);
 Q_CORE_EXPORT Q_DECL_COLD_FUNCTION void qErrnoWarning(const char *msg, ...);
 
-#if QT_DEPRECATED_SINCE(5, 0)// deprecated. Use qInstallMessageHandler instead!
-typedef void (*QtMsgHandler)(QtMsgType, const char *);
-Q_CORE_EXPORT QT_DEPRECATED QtMsgHandler qInstallMsgHandler(QtMsgHandler);
-#endif
-
 typedef void (*QtMessageHandler)(QtMsgType, const QMessageLogContext &, const QString &);
 Q_CORE_EXPORT QtMessageHandler qInstallMessageHandler(QtMessageHandler);
 
diff --git a/tests/auto/corelib/global/qlogging/tst_qlogging.cpp b/tests/auto/corelib/global/qlogging/tst_qlogging.cpp
index 6c6f3a2168..a7d7bea6b3 100644
--- a/tests/auto/corelib/global/qlogging/tst_qlogging.cpp
+++ b/tests/auto/corelib/global/qlogging/tst_qlogging.cpp
@@ -48,10 +48,6 @@ private slots:
 
     void defaultHandler();
     void installMessageHandler();
-#if QT_DEPRECATED_SINCE(5, 0)
-    void installMsgHandler();
-    void installBothHandler();
-#endif
 
 #ifdef QT_BUILD_INTERNAL
     void cleanupFuncinfo_data();
@@ -114,9 +110,6 @@ void tst_qmessagehandler::initTestCase()
 
 void tst_qmessagehandler::cleanup()
 {
-#if QT_DEPRECATED_SINCE(5, 0)
-    qInstallMsgHandler(0);
-#endif
     qInstallMessageHandler((QtMessageHandler)0);
     s_type = QtFatalMsg;
     s_file = 0;
@@ -147,38 +140,6 @@ void tst_qmessagehandler::installMessageHandler()
     QCOMPARE((void*)myHandler, (void*)customMessageHandler);
 }
 
-#if QT_DEPRECATED_SINCE(5, 0)
-void tst_qmessagehandler::installMsgHandler()
-{
-    QtMsgHandler oldHandler = qInstallMsgHandler(customMsgHandler);
-
-    qDebug("installMsgHandler");
-
-    QCOMPARE(s_type, QtDebugMsg);
-    QCOMPARE(s_message, QString::fromLocal8Bit("installMsgHandler"));
-    QCOMPARE(s_file, (const char*)0);
-    QCOMPARE(s_function, (const char*)0);
-    QCOMPARE(s_line, 0);
-
-    QtMsgHandler myHandler = qInstallMsgHandler(oldHandler);
-    QCOMPARE((void*)myHandler, (void*)customMsgHandler);
-}
-
-void tst_qmessagehandler::installBothHandler()
-{
-    qInstallMessageHandler(customMessageHandler);
-    qInstallMsgHandler(customMsgHandler);
-
-    qDebug("installBothHandler"); int line = __LINE__;
-
-    QCOMPARE(s_type, QtDebugMsg);
-    QCOMPARE(s_message, QString::fromLocal8Bit("installBothHandler"));
-    QCOMPARE(s_file, __FILE__);
-    QCOMPARE(s_function, Q_FUNC_INFO);
-    QCOMPARE(s_line, line);
-}
-#endif
-
 # define ADD(x)          QTest::newRow(x) << Q_FUNC_INFO << x;
 
 class TestClass1
diff --git a/tests/manual/diaglib/logwidget.cpp b/tests/manual/diaglib/logwidget.cpp
index 4a6348f03a..0089664a60 100644
--- a/tests/manual/diaglib/logwidget.cpp
+++ b/tests/manual/diaglib/logwidget.cpp
@@ -122,36 +122,17 @@ static void messageHandler(QtMsgType type, const QString &text)
     n++;
 }
 
-#if QT_VERSION >= 0x050000
-
-static void qt5MessageHandler(QtMsgType type, const QMessageLogContext &, const QString &text)
+static void qtMessageHandler(QtMsgType type, const QMessageLogContext &, const QString &text)
 { messageHandler(type, text); }
 
 void LogWidget::install()
 {
-    qInstallMessageHandler(qt5MessageHandler);
+    qInstallMessageHandler(qtMessageHandler);
     qInfo("%s", qPrintable(LogWidget::startupMessage()));
 }
 
 void LogWidget::uninstall() { qInstallMessageHandler(nullptr); }
 
-#else // Qt 5
-
-static QtMsgHandler oldHandler = 0;
-
-static void qt4MessageHandler(QtMsgType type, const char *text)
-{ messageHandler(type, QString::fromLocal8Bit(text)); }
-
-void LogWidget::install()
-{
-    oldHandler = qInstallMsgHandler(qt4MessageHandler);
-    qDebug("%s", qPrintable(LogWidget::startupMessage()));
-}
-
-void LogWidget::uninstall() { qInstallMsgHandler(oldHandler); }
-
-#endif // Qt 4
-
 void LogWidget::appendText(const QString &message)
 {
     appendPlainText(message);
diff --git a/tests/manual/windowflags/controllerwindow.cpp b/tests/manual/windowflags/controllerwindow.cpp
index 6334ea588f..5453a0aa75 100644
--- a/tests/manual/windowflags/controllerwindow.cpp
+++ b/tests/manual/windowflags/controllerwindow.cpp
@@ -318,11 +318,7 @@ LogWidget::~LogWidget()
 
 void LogWidget::install()
 {
-#if QT_VERSION >= 0x050000
     qInstallMessageHandler(qt5MessageHandler);
-#else
-    qInstallMsgHandler(qt4MessageHandler);
-#endif
 }
 
 QString LogWidget::startupMessage()