diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp
index 1ccb67203e..13a8377f4a 100644
--- a/src/corelib/text/qstring.cpp
+++ b/src/corelib/text/qstring.cpp
@@ -1367,10 +1367,6 @@ inline char qToLower(char ch)
 }
 
 
-#if QT_DEPRECATED_SINCE(5, 9)
-const QString::Null QString::null = { };
-#endif
-
 /*!
   \macro QT_RESTRICTED_CAST_FROM_ASCII
   \relates QString
@@ -6246,22 +6242,6 @@ QString QString::toUpper_helper(QString &str)
     return QUnicodeTables::convertCase(str, QUnicodeTables::UpperCase);
 }
 
-#if QT_DEPRECATED_SINCE(5, 14)
-/*!
-    \obsolete
-
-    Use asprintf(), arg() or QTextStream instead.
-*/
-QString &QString::sprintf(const char *cformat, ...)
-{
-    va_list ap;
-    va_start(ap, cformat);
-    *this = vasprintf(cformat, ap);
-    va_end(ap);
-    return *this;
-}
-#endif
-
 // ### Qt 6: Consider whether this function shouldn't be removed See task 202871.
 /*!
     \since 5.5
@@ -6306,18 +6286,6 @@ QString QString::asprintf(const char *cformat, ...)
     return s;
 }
 
-#if QT_DEPRECATED_SINCE(5, 14)
-/*!
-    \obsolete
-
-    Use vasprintf(), arg() or QTextStream instead.
-*/
-QString &QString::vsprintf(const char *cformat, va_list ap)
-{
-    return *this = vasprintf(cformat, ap);
-}
-#endif
-
 static void append_utf8(QString &qs, const char *cs, int len)
 {
     const int oldSize = qs.size();
@@ -7216,16 +7184,6 @@ static ResultList splitString(const StringSource &source, QStringView sep,
     return list;
 }
 
-#if QT_DEPRECATED_SINCE(5, 15)
-Qt::SplitBehavior mapSplitBehavior(QString::SplitBehavior sb)
-{
-QT_WARNING_PUSH
-QT_WARNING_DISABLE_DEPRECATED
-    return sb & QString::SkipEmptyParts ? Qt::SkipEmptyParts : Qt::KeepEmptyParts;
-QT_WARNING_POP
-}
-#endif
-
 } // namespace
 
 /*!
@@ -7263,17 +7221,6 @@ QStringList QString::split(const QString &sep, Qt::SplitBehavior behavior, Qt::C
     return splitString<QStringList>(*this, sep, behavior, cs);
 }
 
-#if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \obsolete
-*/
-QStringList QString::split(const QString &sep, SplitBehavior behavior, Qt::CaseSensitivity cs) const
-{
-    return split(sep, mapSplitBehavior(behavior), cs);
-}
-#endif
-
 /*!
     Splits the string into substring references wherever \a sep occurs, and
     returns the list of those strings.
@@ -7293,18 +7240,6 @@ QVector<QStringRef> QString::splitRef(const QString &sep, Qt::SplitBehavior beha
     return splitString<QVector<QStringRef>>(QStringRef(this), sep, behavior, cs);
 }
 
-#if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \obsolete
-    \since 5.4
-*/
-QVector<QStringRef> QString::splitRef(const QString &sep, SplitBehavior behavior, Qt::CaseSensitivity cs) const
-{
-    return splitRef(sep, mapSplitBehavior(behavior), cs);
-}
-#endif
-
 /*!
     \overload
     \since 5.14
@@ -7314,17 +7249,6 @@ QStringList QString::split(QChar sep, Qt::SplitBehavior behavior, Qt::CaseSensit
     return splitString<QStringList>(*this, QStringView(&sep, 1), behavior, cs);
 }
 
-#if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \obsolete
-*/
-QStringList QString::split(QChar sep, SplitBehavior behavior, Qt::CaseSensitivity cs) const
-{
-    return split(sep, mapSplitBehavior(behavior), cs);
-}
-#endif
-
 /*!
     \overload
     \since 5.14
@@ -7335,17 +7259,6 @@ QVector<QStringRef> QString::splitRef(QChar sep, Qt::SplitBehavior behavior,
     return splitString<QVector<QStringRef> >(QStringRef(this), QStringView(&sep, 1), behavior, cs);
 }
 
-#if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \since 5.4
-*/
-QVector<QStringRef> QString::splitRef(QChar sep, SplitBehavior behavior, Qt::CaseSensitivity cs) const
-{
-    return splitRef(sep, mapSplitBehavior(behavior), cs);
-}
-#endif
-
 /*!
     Splits the string into substrings references wherever \a sep occurs, and
     returns the list of those strings.
@@ -7363,18 +7276,6 @@ QVector<QStringRef> QStringRef::split(const QString &sep, Qt::SplitBehavior beha
     return splitString<QVector<QStringRef> >(*this, sep, behavior, cs);
 }
 
-#if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \since 5.4
-    \obsolete
-*/
-QVector<QStringRef> QStringRef::split(const QString &sep, QString::SplitBehavior behavior, Qt::CaseSensitivity cs) const
-{
-    return split(sep, mapSplitBehavior(behavior), cs);
-}
-#endif
-
 /*!
     \overload
     \since 5.14
@@ -7384,19 +7285,6 @@ QVector<QStringRef> QStringRef::split(QChar sep, Qt::SplitBehavior behavior, Qt:
     return splitString<QVector<QStringRef> >(*this, QStringView(&sep, 1), behavior, cs);
 }
 
-#if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \since 5.4
-    \obsolete
-*/
-QVector<QStringRef> QStringRef::split(QChar sep, QString::SplitBehavior behavior, Qt::CaseSensitivity cs) const
-{
-    return split(sep, mapSplitBehavior(behavior), cs);
-}
-#endif
-
-
 /*!
     \fn QList<QStringView> QStringView::split(QChar sep, Qt::SplitBehavior behavior, Qt::CaseSensitivity cs) const
     \fn QList<QStringView> QStringView::split(QStringView sep, Qt::SplitBehavior behavior, Qt::CaseSensitivity cs) const
@@ -7485,18 +7373,6 @@ QStringList QString::split(const QRegularExpression &re, Qt::SplitBehavior behav
     return splitString<QStringList>(*this, re, behavior);
 }
 
-#  if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \since 5.0
-    \obsolete
-*/
-QStringList QString::split(const QRegularExpression &re, SplitBehavior behavior) const
-{
-    return split(re, mapSplitBehavior(behavior));
-}
-#  endif
-
 /*!
     \overload
     \since 5.14
@@ -7534,17 +7410,6 @@ QList<QStringView> QStringView::split(const QRegularExpression &re, Qt::SplitBeh
     return splitString<QList<QStringView>>(*this, re, behavior);
 }
 
-#  if QT_DEPRECATED_SINCE(5, 15)
-/*!
-    \overload
-    \since 5.4
-    \obsolete
-*/
-QVector<QStringRef> QString::splitRef(const QRegularExpression &re, SplitBehavior behavior) const
-{
-    return splitRef(re, mapSplitBehavior(behavior));
-}
-#  endif
 #endif // QT_CONFIG(regularexpression)
 
 /*!
diff --git a/src/corelib/text/qstring.h b/src/corelib/text/qstring.h
index bb946b655e..77a95c6280 100644
--- a/src/corelib/text/qstring.h
+++ b/src/corelib/text/qstring.h
@@ -247,10 +247,6 @@ private:
 Q_DECLARE_TYPEINFO(QLatin1String, Q_MOVABLE_TYPE);
 
 // Qt 4.x compatibility
-#if QT_DEPRECATED_SINCE(5, 14)
-QT_DEPRECATED_X("Use QLatin1String")
-typedef QLatin1String QLatin1Literal;
-#endif
 
 //
 // QLatin1String inline implementations
@@ -386,12 +382,6 @@ public:
     arg(Args &&...args) const
     { return qToStringViewIgnoringNull(*this).arg(std::forward<Args>(args)...); }
 
-#if QT_DEPRECATED_SINCE(5, 14)
-    QT_DEPRECATED_X("Use vasprintf(), arg() or QTextStream instead")
-    QString &vsprintf(const char *format, va_list ap) Q_ATTRIBUTE_FORMAT_PRINTF(2, 0);
-    QT_DEPRECATED_X("Use asprintf(), arg() or QTextStream instead")
-    QString &sprintf(const char *format, ...) Q_ATTRIBUTE_FORMAT_PRINTF(2, 3);
-#endif
     static QString vasprintf(const char *format, va_list ap) Q_ATTRIBUTE_FORMAT_PRINTF(1, 0);
     static QString asprintf(const char *format, ...) Q_ATTRIBUTE_FORMAT_PRINTF(1, 2);
 
@@ -586,33 +576,6 @@ public:
     { return replace(re, QString()); }
 #endif
 
-#if QT_DEPRECATED_SINCE(5, 15)
-    enum SplitBehavior // ### Qt 6: replace with Qt:: version
-    {
-        KeepEmptyParts Q_DECL_ENUMERATOR_DEPRECATED,
-        SkipEmptyParts Q_DECL_ENUMERATOR_DEPRECATED
-    };
-
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QStringList split(const QString &sep, SplitBehavior behavior,
-                                        Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QVector<QStringRef> splitRef(const QString &sep, SplitBehavior behavior,
-                                                   Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QStringList split(QChar sep, SplitBehavior behavior,
-                                        Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QVector<QStringRef> splitRef(QChar sep, SplitBehavior behavior,
-                                                   Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
-#if QT_CONFIG(regularexpression)
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QStringList split(const QRegularExpression &sep, SplitBehavior behavior) const;
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QVector<QStringRef> splitRef(const QRegularExpression &sep, SplitBehavior behavior) const;
-#endif
-#endif // 5.15 deprecations
-
 public:
     Q_REQUIRED_RESULT
     QStringList split(const QString &sep, Qt::SplitBehavior behavior = Qt::KeepEmptyParts,
@@ -927,14 +890,7 @@ public:
     static QString fromNSString(const NSString *string);
     NSString *toNSString() const Q_DECL_NS_RETURNS_AUTORELEASED;
 #endif
-    // compatibility
-#if QT_DEPRECATED_SINCE(5, 9)
-    struct Null { };
-    QT_DEPRECATED_X("use QString()")
-    static const Null null;
-    inline QString(const Null &) {}
-    inline QString &operator=(const Null &) { *this = QString(); return *this; }
-#endif
+
     inline bool isNull() const { return d->isNull(); }
 
 
@@ -1205,19 +1161,6 @@ inline bool QString::contains(QChar c, Qt::CaseSensitivity cs) const
 inline bool QString::contains(QStringView s, Qt::CaseSensitivity cs) const noexcept
 { return indexOf(s, 0, cs) != -1; }
 
-#if QT_DEPRECATED_SINCE(5, 9)
-inline bool operator==(QString::Null, QString::Null) { return true; }
-QT_DEPRECATED_X("use QString::isNull()")
-inline bool operator==(QString::Null, const QString &s) { return s.isNull(); }
-QT_DEPRECATED_X("use QString::isNull()")
-inline bool operator==(const QString &s, QString::Null) { return s.isNull(); }
-inline bool operator!=(QString::Null, QString::Null) { return false; }
-QT_DEPRECATED_X("use !QString::isNull()")
-inline bool operator!=(QString::Null, const QString &s) { return !s.isNull(); }
-QT_DEPRECATED_X("use !QString::isNull()")
-inline bool operator!=(const QString &s, QString::Null) { return !s.isNull(); }
-#endif
-
 inline bool operator==(QLatin1String s1, QLatin1String s2) noexcept
 { return s1.size() == s2.size() && (!s1.size() || !memcmp(s1.latin1(), s2.latin1(), s1.size())); }
 inline bool operator!=(QLatin1String s1, QLatin1String s2) noexcept
@@ -1497,15 +1440,6 @@ public:
     int count(QChar c, Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
     int count(const QStringRef &s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
 
-#if QT_DEPRECATED_SINCE(5, 15)
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QVector<QStringRef> split(const QString &sep, QString::SplitBehavior behavior,
-                              Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
-    Q_REQUIRED_RESULT QT_DEPRECATED_VERSION_X_5_15("Use Qt::SplitBehavior variant instead")
-    QVector<QStringRef> split(QChar sep, QString::SplitBehavior behavior,
-                              Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
-#endif // 5.15 deprecations
-
     Q_REQUIRED_RESULT
     QVector<QStringRef> split(const QString &sep, Qt::SplitBehavior behavior = Qt::KeepEmptyParts,
                               Qt::CaseSensitivity cs = Qt::CaseSensitive) const;
@@ -1881,14 +1815,6 @@ inline QString operator+(QChar s1, const QStringRef &s2)
 { QString t; t.reserve(1 + s2.size()); t += s1; t += s2; return t; }
 #endif // !(QT_USE_FAST_OPERATOR_PLUS || QT_USE_QSTRINGBUILDER)
 
-namespace Qt {
-#if QT_DEPRECATED_SINCE(5, 0)
-QT_DEPRECATED inline QString escape(const QString &plain) {
-    return plain.toHtmlEscaped();
-}
-#endif
-}
-
 namespace QtPrivate {
 // used by qPrintable() and qUtf8Printable() macros
 inline const QString &asString(const QString &s)    { return s; }
diff --git a/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp b/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
index 69322356a8..0b760f75a8 100644
--- a/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
+++ b/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
@@ -379,13 +379,6 @@ void tst_QVariant::isNull()
     QString str1;
     QVariant var1( str1 );
     QVERIFY( var1.isNull() );
-#if QT_DEPRECATED_SINCE(5, 9)
-QT_WARNING_PUSH
-QT_WARNING_DISABLE_DEPRECATED
-    QVariant var2( QString::null );
-QT_WARNING_POP
-    QVERIFY( var2.isNull() );
-#endif
 
     QVariant var3( QString( "blah" ) );
     QVERIFY( !var3.isNull() );
@@ -405,19 +398,6 @@ QT_WARNING_POP
     QVariant varLL( (qlonglong)0 );
     QVERIFY( !varLL.isNull() );
 
-#if QT_DEPRECATED_SINCE(5, 9)
-QT_WARNING_PUSH
-QT_WARNING_DISABLE_DEPRECATED
-    QVariant var7(QString::null);
-QT_WARNING_POP
-    QVERIFY(var7.isNull());
-QT_WARNING_PUSH
-QT_WARNING_DISABLE_DEPRECATED
-    var7 = QVariant::fromValue<QString>(QString::null);
-QT_WARNING_POP
-    QVERIFY(var7.isNull());
-#endif
-
     QVariant var8(QMetaType::Nullptr, nullptr);
     QVERIFY(var8.isNull());
     var8 = QVariant::fromValue<std::nullptr_t>(nullptr);
diff --git a/tests/auto/corelib/text/qstringref/tst_qstringref.cpp b/tests/auto/corelib/text/qstringref/tst_qstringref.cpp
index 7eea1db7c8..f6a2326af1 100644
--- a/tests/auto/corelib/text/qstringref/tst_qstringref.cpp
+++ b/tests/auto/corelib/text/qstringref/tst_qstringref.cpp
@@ -598,9 +598,6 @@ void tst_QStringRef::startsWith()
         QVERIFY(!ref.startsWith("ABCDEF"));
         QVERIFY(ref.startsWith(""));
         QVERIFY(ref.startsWith(QString()));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.startsWith(QString::null));
-#endif
         QVERIFY(ref.startsWith('A'));
         QVERIFY(ref.startsWith(QLatin1Char('A')));
         QVERIFY(ref.startsWith(QChar('A')));
@@ -628,9 +625,6 @@ void tst_QStringRef::startsWith()
         QVERIFY(!ref.startsWith("abcdef", Qt::CaseInsensitive));
         QVERIFY(ref.startsWith("", Qt::CaseInsensitive));
         QVERIFY(ref.startsWith(QString(), Qt::CaseInsensitive));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.startsWith(QString::null, Qt::CaseInsensitive));
-#endif
         QVERIFY(ref.startsWith('a', Qt::CaseInsensitive));
         QVERIFY(ref.startsWith('A', Qt::CaseInsensitive));
         QVERIFY(ref.startsWith(QLatin1Char('a'), Qt::CaseInsensitive));
@@ -664,9 +658,6 @@ void tst_QStringRef::startsWith()
         CREATE_REF(a);
         QVERIFY(ref.startsWith(""));
         QVERIFY(ref.startsWith(QString()));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.startsWith(QString::null));
-#endif
         QVERIFY(!ref.startsWith("ABC"));
 
         QVERIFY(ref.startsWith(QLatin1String("")));
@@ -681,9 +672,6 @@ void tst_QStringRef::startsWith()
         const QStringRef ref;
         QVERIFY(!ref.startsWith(""));
         QVERIFY(ref.startsWith(QString()));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.startsWith(QString::null));
-#endif
         QVERIFY(!ref.startsWith("ABC"));
 
         QVERIFY(!ref.startsWith(QLatin1String("")));
@@ -707,9 +695,6 @@ void tst_QStringRef::endsWith()
         QVERIFY(!ref.endsWith("ABCDEF"));
         QVERIFY(ref.endsWith(""));
         QVERIFY(ref.endsWith(QString()));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.endsWith(QString::null));
-#endif
         QVERIFY(ref.endsWith('B'));
         QVERIFY(ref.endsWith(QLatin1Char('B')));
         QVERIFY(ref.endsWith(QChar('B')));
@@ -737,9 +722,6 @@ void tst_QStringRef::endsWith()
         QVERIFY(!ref.endsWith("abcdef", Qt::CaseInsensitive));
         QVERIFY(ref.endsWith("", Qt::CaseInsensitive));
         QVERIFY(ref.endsWith(QString(), Qt::CaseInsensitive));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.endsWith(QString::null, Qt::CaseInsensitive));
-#endif
         QVERIFY(ref.endsWith('b', Qt::CaseInsensitive));
         QVERIFY(ref.endsWith('B', Qt::CaseInsensitive));
         QVERIFY(ref.endsWith(QLatin1Char('b'), Qt::CaseInsensitive));
@@ -774,9 +756,6 @@ void tst_QStringRef::endsWith()
         CREATE_REF(a);
         QVERIFY(ref.endsWith(""));
         QVERIFY(ref.endsWith(QString()));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.endsWith(QString::null));
-#endif
         QVERIFY(!ref.endsWith("ABC"));
         QVERIFY(!ref.endsWith(QLatin1Char(0)));
         QVERIFY(!ref.endsWith(QLatin1Char('x')));
@@ -791,9 +770,6 @@ void tst_QStringRef::endsWith()
         QStringRef ref;
         QVERIFY(!ref.endsWith(""));
         QVERIFY(ref.endsWith(QString()));
-#if QT_DEPRECATED_SINCE(5, 9)
-        QVERIFY(ref.endsWith(QString::null));
-#endif
         QVERIFY(!ref.endsWith("ABC"));
 
         QVERIFY(!ref.endsWith(QLatin1String("")));