diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index 5c80cb01091..9b64be67ceb 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -1188,6 +1188,15 @@ QDebug &QDebug::putTupleLikeImplImpl(const char *ns, const char *what,
     \c T need to support streaming into QDebug.
 */
 
+/*!
+    \fn template <typename Key, typename Compare, typename Alloc> QDebug operator<<(QDebug debug, const std::multiset<Key, Compare, Alloc> &multiset)
+    \relates QDebug
+    \since 6.9
+
+    Writes the contents of \a multiset to \a debug. The \c Key type
+    needs to support streaming into QDebug.
+*/
+
 /*!
     \fn template <typename Key, typename Compare, typename Alloc> QDebug operator<<(QDebug debug, const std::set<Key, Compare, Alloc> &set)
     \relates QDebug
diff --git a/src/corelib/io/qdebug.h b/src/corelib/io/qdebug.h
index b7b34f654dd..f12b7dba13d 100644
--- a/src/corelib/io/qdebug.h
+++ b/src/corelib/io/qdebug.h
@@ -439,6 +439,12 @@ inline QDebugIfHasDebugStream<Key, T> operator<<(QDebug debug, const std::multim
     return QtPrivate::printSequentialContainer(std::move(debug), "std::multimap", map); // yes, sequential: *it is std::pair
 }
 
+template <typename Key, typename Compare, typename Alloc>
+inline QDebug operator<<(QDebug debug, const std::multiset<Key, Compare, Alloc> &multiset)
+{
+    return QtPrivate::printSequentialContainer(std::move(debug), "std::multiset", multiset);
+}
+
 template <typename Key, typename Compare, typename Alloc>
 inline QDebug operator<<(QDebug debug, const std::set<Key, Compare, Alloc>& set)
 {
diff --git a/tests/auto/corelib/io/qdebug/tst_qdebug.cpp b/tests/auto/corelib/io/qdebug/tst_qdebug.cpp
index b2fd65fff5d..3b50636dfdd 100644
--- a/tests/auto/corelib/io/qdebug/tst_qdebug.cpp
+++ b/tests/auto/corelib/io/qdebug/tst_qdebug.cpp
@@ -38,6 +38,7 @@ static_assert(QTypeTraits::has_ostream_operator_v<QDebug, int>);
 static_assert(QTypeTraits::has_ostream_operator_v<QDebug, QMetaType>);
 static_assert(QTypeTraits::has_ostream_operator_v<QDebug, QList<int>>);
 static_assert(QTypeTraits::has_ostream_operator_v<QDebug, QMap<int, QString>>);
+static_assert(QTypeTraits::has_ostream_operator_v<QDebug, std::multiset<int>>);
 static_assert(QTypeTraits::has_ostream_operator_v<QDebug, std::set<int>>);
 static_assert(QTypeTraits::has_ostream_operator_v<QDebug, std::tuple<int, QString, QMap<int, QString>>>);
 static_assert(QTypeTraits::has_ostream_operator_v<QDebug, std::unordered_map<int, QString>>);
@@ -88,6 +89,7 @@ private slots:
     void qDebugQStringView() const;
     void qDebugQUtf8StringView() const;
     void qDebugQLatin1String() const;
+    void qDebugStdMultiSet() const;
     void qDebugStdPair() const;
     void qDebugStdSet() const;
     void qDebugStdTuple() const;
@@ -702,6 +704,33 @@ void tst_QDebug::qDebugQLatin1String() const
     QCOMPARE(s_msg, QString("\"\\nSm\\u00F8rg\\u00E5sbord\\\\\""));
 }
 
+void tst_QDebug::qDebugStdMultiSet() const
+{
+    QByteArray file, function;
+    int line = 0;
+    MessageHandlerSetter mhs(myMessageHandler);
+
+    {
+        QDebug d = qDebug();
+        std::multiset<int> multiset{1, 2, 3, 2, 1};
+        d.nospace().noquote() << multiset;
+    }
+#ifndef QT_NO_MESSAGELOGCONTEXT
+    file = __FILE__; line = __LINE__ - 5; function = Q_FUNC_INFO;
+#endif
+    QCOMPARE(s_msgType, QtDebugMsg);
+    QCOMPARE(s_msg, "std::multiset(1, 1, 2, 2, 3)"_L1);
+    QCOMPARE(s_file, file);
+    QCOMPARE(s_line, line);
+    QCOMPARE(s_function, function);
+
+    qDebug() << std::multiset<std::string>{"apple", "banana", "cherry", "banana", "apple"};
+    QCOMPARE(s_msg, "std::multiset(\"apple\", \"apple\", \"banana\", \"banana\", \"cherry\")"_L1);
+
+    qDebug() << std::multiset<int>{};
+    QCOMPARE(s_msg, "std::multiset()"_L1);
+}
+
 void tst_QDebug::qDebugStdPair() const
 {
     QByteArray file, function;