diff --git a/applets/notifications/package/contents/ui/global/Globals.qml b/applets/notifications/package/contents/ui/global/Globals.qml
--- a/applets/notifications/package/contents/ui/global/Globals.qml
+++ b/applets/notifications/package/contents/ui/global/Globals.qml
@@ -329,6 +329,7 @@
         whitelistedNotifyRcNames: globals.inhibited ? notificationSettings.doNotDisturbPopupWhitelistedServices : []
         showJobs: notificationSettings.jobsInNotifications
         sortMode: NotificationManager.Notifications.SortByTypeAndUrgency
+        sortOrder: Qt.AscendingOrder
         groupMode: NotificationManager.Notifications.GroupDisabled
         urgencies: {
             var urgencies = 0;
diff --git a/libnotificationmanager/notifications.h b/libnotificationmanager/notifications.h
--- a/libnotificationmanager/notifications.h
+++ b/libnotificationmanager/notifications.h
@@ -140,6 +140,20 @@
      */
     Q_PROPERTY(SortMode sortMode READ sortMode WRITE setSortMode NOTIFY sortModeChanged)
 
+    /**
+     * The sort order for notifications.
+     *
+     * This only affects the sort order by date. When @c sortMode is set to SortByTypeAndUrgency
+     * the order of notification groups (e.g. high - jobs - normal - low) is unaffected, and only
+     * notifications within the same group are either sorted ascending or descending by their
+     * creation/update date.
+     *
+     * Default is DescendingOrder, i.e. newest notifications come first.
+     *
+     * @since 5.19
+     */
+    Q_PROPERTY(Qt::SortOrder sortOrder READ sortOrder WRITE setSortOrder NOTIFY sortOrderChanged)
+
     /**
      * The group mode for notifications.
      *
@@ -368,6 +382,9 @@
     SortMode sortMode() const;
     void setSortMode(SortMode sortMode);
 
+    Qt::SortOrder sortOrder() const;
+    void setSortOrder(Qt::SortOrder sortOrder);
+
     GroupMode groupMode() const;
     void setGroupMode(GroupMode groupMode);
 
@@ -516,6 +533,7 @@
     void showJobsChanged();
     void urgenciesChanged();
     void sortModeChanged();
+    void sortOrderChanged();
     void groupModeChanged();
     void groupLimitChanged();
     void expandUnreadChanged();
diff --git a/libnotificationmanager/notifications.cpp b/libnotificationmanager/notifications.cpp
--- a/libnotificationmanager/notifications.cpp
+++ b/libnotificationmanager/notifications.cpp
@@ -209,6 +209,7 @@
     if (!sortModel) {
         sortModel = new NotificationSortProxyModel(q);
         connect(sortModel, &NotificationSortProxyModel::sortModeChanged, q, &Notifications::sortModeChanged);
+        connect(sortModel, &NotificationSortProxyModel::sortOrderChanged, q, &Notifications::sortOrderChanged);
     }
 
     if (!limiterModel) {
@@ -572,6 +573,16 @@
     d->sortModel->setSortMode(sortMode);
 }
 
+Qt::SortOrder Notifications::sortOrder() const
+{
+    return d->sortModel->sortOrder();
+}
+
+void Notifications::setSortOrder(Qt::SortOrder sortOrder)
+{
+    d->sortModel->setSortOrder(sortOrder);
+}
+
 Notifications::GroupMode Notifications::groupMode() const
 {
     return d->groupMode;
diff --git a/libnotificationmanager/notificationsortproxymodel.cpp b/libnotificationmanager/notificationsortproxymodel.cpp
--- a/libnotificationmanager/notificationsortproxymodel.cpp
+++ b/libnotificationmanager/notificationsortproxymodel.cpp
@@ -50,6 +50,20 @@
     }
 }
 
+Qt::SortOrder NotificationSortProxyModel::sortOrder() const
+{
+    return m_sortOrder;
+}
+
+void NotificationSortProxyModel::setSortOrder(Qt::SortOrder sortOrder)
+{
+    if (m_sortOrder != sortOrder) {
+        m_sortOrder = sortOrder;
+        invalidate();
+        emit sortOrderChanged();
+    }
+}
+
 int sortScore(const QModelIndex &idx)
 {
     const auto urgency = idx.data(Notifications::UrgencyRole).toInt();
@@ -109,8 +123,11 @@
             timeRight = source_right.data(Notifications::CreatedRole).toDateTime();
         }
 
-        // sorts descending by time (newest first)
-        return timeLeft > timeRight;
+        if (m_sortOrder == Qt::DescendingOrder) {
+            return timeLeft > timeRight;
+        } else {
+            return timeLeft < timeRight;
+        }
     }
 
     return scoreLeft > scoreRight;
diff --git a/libnotificationmanager/notificationsortproxymodel_p.h b/libnotificationmanager/notificationsortproxymodel_p.h
--- a/libnotificationmanager/notificationsortproxymodel_p.h
+++ b/libnotificationmanager/notificationsortproxymodel_p.h
@@ -39,14 +39,19 @@
     Notifications::SortMode sortMode() const;
     void setSortMode(Notifications::SortMode);
 
+    Qt::SortOrder sortOrder() const;
+    void setSortOrder(Qt::SortOrder sortOrder);
+
 signals:
     void sortModeChanged();
+    void sortOrderChanged();
 
 protected:
     bool lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const override;
 
 private:
     Notifications::SortMode m_sortMode = Notifications::SortByDate;
+    Qt::SortOrder m_sortOrder = Qt::DescendingOrder;
 
 };