diff --git a/src/wayland/autotests/client/test_plasma_window_model.cpp b/src/wayland/autotests/client/test_plasma_window_model.cpp
index f0436ada57..640f61ca57 100644
--- a/src/wayland/autotests/client/test_plasma_window_model.cpp
+++ b/src/wayland/autotests/client/test_plasma_window_model.cpp
@@ -79,6 +79,7 @@ private Q_SLOTS:
     void testGeometry();
     void testTitle();
     void testAppId();
+    void testPid();
     void testVirtualDesktop();
     // TODO icon: can we ensure a theme is installed on CI?
     void testRequests();
@@ -220,6 +221,7 @@ void PlasmaWindowModelTest::testRoleNames_data()
     QTest::newRow("decoration") << int(Qt::DecorationRole) << QByteArrayLiteral("DecorationRole");
 
     QTest::newRow("AppId")                << int(PlasmaWindowModel::AppId) << QByteArrayLiteral("AppId");
+    QTest::newRow("Pid")                  << int(PlasmaWindowModel::Pid) << QByteArrayLiteral("Pid");
     QTest::newRow("IsActive")             << int(PlasmaWindowModel::IsActive) << QByteArrayLiteral("IsActive");
     QTest::newRow("IsFullscreenable")     << int(PlasmaWindowModel::IsFullscreenable) << QByteArrayLiteral("IsFullscreenable");
     QTest::newRow("IsFullscreen")         << int(PlasmaWindowModel::IsFullscreen) << QByteArrayLiteral("IsFullscreen");
@@ -332,6 +334,7 @@ void PlasmaWindowModelTest::testDefaultData_data()
     QTest::newRow("IsVirtualDesktopChangeable") << int(PlasmaWindowModel::IsVirtualDesktopChangeable) << QVariant(false);
     QTest::newRow("IsCloseable")          << int(PlasmaWindowModel::IsCloseable) << QVariant(false);
     QTest::newRow("Geometry")             << int(PlasmaWindowModel::Geometry) << QVariant(QRect());
+    QTest::newRow("Pid")                  << int(PlasmaWindowModel::Pid) << QVariant(0);
 }
 
 void PlasmaWindowModelTest::testDefaultData()
@@ -521,6 +524,31 @@ void PlasmaWindowModelTest::testAppId()
     QCOMPARE(model->data(index, PlasmaWindowModel::AppId).toString(), QStringLiteral("org.kde.testapp"));
 }
 
+void PlasmaWindowModelTest::testPid()
+{
+    auto model = m_pw->createWindowModel();
+    QVERIFY(model);
+    QSignalSpy rowInsertedSpy(model, &PlasmaWindowModel::rowsInserted);
+    QVERIFY(rowInsertedSpy.isValid());
+    auto w = m_pwInterface->createWindow(m_pwInterface);
+    QVERIFY(w);
+    QVERIFY(rowInsertedSpy.wait());
+    m_connection->flush();
+    m_display->dispatchEvents();
+    QSignalSpy dataChangedSpy(model, &PlasmaWindowModel::dataChanged);
+    QVERIFY(dataChangedSpy.isValid());
+
+    const QModelIndex index = model->index(0);
+    QCOMPARE(model->data(index, PlasmaWindowModel::Pid).toInt(), 0);
+
+    w->setPid(1337);
+    QVERIFY(dataChangedSpy.wait());
+    QCOMPARE(dataChangedSpy.count(), 1);
+    QCOMPARE(dataChangedSpy.last().first().toModelIndex(), index);
+    QCOMPARE(dataChangedSpy.last().last().value<QVector<int>>(), QVector<int>{int(PlasmaWindowModel::Pid)});
+    QCOMPARE(model->data(index, PlasmaWindowModel::Pid).toInt(), 1337);
+}
+
 void PlasmaWindowModelTest::testVirtualDesktop()
 {
     auto model = m_pw->createWindowModel();
diff --git a/src/wayland/autotests/client/test_wayland_windowmanagement.cpp b/src/wayland/autotests/client/test_wayland_windowmanagement.cpp
index 0bd376db84..662f7dc8ac 100644
--- a/src/wayland/autotests/client/test_wayland_windowmanagement.cpp
+++ b/src/wayland/autotests/client/test_wayland_windowmanagement.cpp
@@ -67,6 +67,7 @@ private Q_SLOTS:
     void testParentWindow();
     void testGeometry();
     void testIcon();
+    void testPid();
 
     void cleanup();
 
@@ -581,5 +582,24 @@ void TestWindowManagement::testIcon()
     QCOMPARE(m_window->icon().name(), QStringLiteral("xorg"));
 }
 
+void TestWindowManagement::testPid()
+{
+    using namespace KWayland::Client;
+    QVERIFY(m_window);
+    QVERIFY(m_windowInterface);
+    QVERIFY(m_window->pid() == 0);
+    QSignalSpy pidChangedSpy(m_window, &PlasmaWindow::pidChanged);
+    QVERIFY(pidChangedSpy.isValid());
+    // doing nothing does nothing
+    QVERIFY(!pidChangedSpy.wait(10));
+    m_windowInterface->setPid(1984);
+    QVERIFY(pidChangedSpy.wait());
+    QVERIFY(m_window->pid() == 1984);
+    // no signal when the same value is set twice
+    m_windowInterface->setPid(1984);
+    QVERIFY(!pidChangedSpy.wait(10));
+    QVERIFY(m_window->pid() == 1984);
+}
+
 QTEST_MAIN(TestWindowManagement)
 #include "test_wayland_windowmanagement.moc"
diff --git a/src/wayland/plasmawindowmanagement_interface.cpp b/src/wayland/plasmawindowmanagement_interface.cpp
index f2047d7029..cfcadfb02d 100644
--- a/src/wayland/plasmawindowmanagement_interface.cpp
+++ b/src/wayland/plasmawindowmanagement_interface.cpp
@@ -72,6 +72,7 @@ public:
     void createResource(wl_resource *parent, uint32_t id);
     void setTitle(const QString &title);
     void setAppId(const QString &appId);
+    void setPid(quint32 pid);
     void setThemedIconName(const QString &iconName);
     void setIcon(const QIcon &icon);
     void setVirtualDesktop(quint32 desktop);
@@ -109,6 +110,7 @@ private:
     PlasmaWindowInterface *q;
     QString m_title;
     QString m_appId;
+    quint32 m_pid = 0;
     QString m_themedIconName;
     QIcon m_icon;
     quint32 m_virtualDesktop = 0;
@@ -329,6 +331,9 @@ void PlasmaWindowInterface::Private::createResource(wl_resource *parent, uint32_
     if (!m_appId.isEmpty()) {
         org_kde_plasma_window_send_app_id_changed(resource, m_appId.toUtf8().constData());
     }
+    if (m_pid != 0) {
+        org_kde_plasma_window_send_pid_changed(resource, m_pid);
+    }
     if (!m_title.isEmpty()) {
         org_kde_plasma_window_send_title_changed(resource, m_title.toUtf8().constData());
     }
@@ -369,6 +374,17 @@ void PlasmaWindowInterface::Private::setAppId(const QString &appId)
     }
 }
 
+void PlasmaWindowInterface::Private::setPid(quint32 pid)
+{
+    if (m_pid == pid) {
+        return;
+    }
+    m_pid = pid;
+    for (auto it = resources.constBegin(); it != resources.constEnd(); ++it) {
+        org_kde_plasma_window_send_pid_changed(*it, pid);
+    }
+}
+
 void PlasmaWindowInterface::Private::setThemedIconName(const QString &iconName)
 {
     if (m_themedIconName == iconName) {
@@ -655,6 +671,11 @@ void PlasmaWindowInterface::setAppId(const QString &appId)
     d->setAppId(appId);
 }
 
+void PlasmaWindowInterface::setPid(quint32 pid)
+{
+    d->setPid(pid);
+}
+
 void PlasmaWindowInterface::setTitle(const QString &title)
 {
     d->setTitle(title);
diff --git a/src/wayland/plasmawindowmanagement_interface.h b/src/wayland/plasmawindowmanagement_interface.h
index fb7b8c2b87..99512e7908 100644
--- a/src/wayland/plasmawindowmanagement_interface.h
+++ b/src/wayland/plasmawindowmanagement_interface.h
@@ -87,6 +87,7 @@ public:
 
     void setTitle(const QString &title);
     void setAppId(const QString &appId);
+    void setPid(quint32 pid);
     void setVirtualDesktop(quint32 desktop);
     void setActive(bool set);
     void setMinimized(bool set);