diff --git a/applets/digital-clock/package/contents/config/main.xml b/applets/digital-clock/package/contents/config/main.xml
--- a/applets/digital-clock/package/contents/config/main.xml
+++ b/applets/digital-clock/package/contents/config/main.xml
@@ -70,4 +70,10 @@
       <default>false</default>
     </entry>
   </group>
+  <group name="Calendar">
+    <entry name="firstDayOfWeek" type="int">
+      <!-- Enum: -1 = Locale default, 0=Sunday, 1=Monday, ..., 6=Saturday, (7=Sunday also works) -->
+      <default>-1</default>
+    </entry>
+  </group>
 </kcfg>
diff --git a/applets/digital-clock/package/contents/ui/CalendarView.qml b/applets/digital-clock/package/contents/ui/CalendarView.qml
--- a/applets/digital-clock/package/contents/ui/CalendarView.qml
+++ b/applets/digital-clock/package/contents/ui/CalendarView.qml
@@ -354,6 +354,13 @@
             borderOpacity: 0.25
             today: root.tzDate
             showWeekNumbers: plasmoid.configuration.showWeekNumbers
+            firstDayOfWeek: {
+                if (plasmoid.configuration.firstDayOfWeek == -1) {
+                    return Qt.locale().firstDayOfWeek
+                } else {
+                    return plasmoid.configuration.firstDayOfWeek
+                }
+            }
             anchors.fill: parent
         }
 
diff --git a/applets/digital-clock/package/contents/ui/configCalendar.qml b/applets/digital-clock/package/contents/ui/configCalendar.qml
--- a/applets/digital-clock/package/contents/ui/configCalendar.qml
+++ b/applets/digital-clock/package/contents/ui/configCalendar.qml
@@ -32,6 +32,7 @@
     signal configurationChanged
 
     property alias cfg_showWeekNumbers: showWeekNumbers.checked
+    property int cfg_firstDayOfWeek: -1
 
     function saveConfig()
     {
@@ -50,6 +51,38 @@
             text: i18n("Show week numbers")
         }
 
+        QtControls.ComboBox {
+            id: firstDayOfWeekComboBox
+            Kirigami.FormData.label: i18n("First day of week:")
+            // [-1, 0, 1, 2, 3, 4, 5, 6] // Default = -1, 0..6 = Sun..Sat
+            model: ListModel {}
+            textRole: "text"
+
+            Connections {
+                target: calendarPage
+                onCfg_firstDayOfWeekChanged: firstDayOfWeekComboBox.currentIndex = cfg_firstDayOfWeek + 1
+            }
+
+            Component.onCompleted: {
+                model.append({
+                    text: i18n("Default"),
+                    value: -1,
+                })
+                for (var i = 0; i < 7; i++) {
+                    model.append({
+                        text: Qt.locale().dayName(i),
+                        value: i,
+                    })
+                }
+
+                // The firstDayOfWeek enum starts at -1 instead of 0
+                currentIndex = cfg_firstDayOfWeek + 1
+                currentIndexChanged.connect(function(){
+                    cfg_firstDayOfWeek = currentIndex - 1
+                })
+            }
+        }
+
         Item {
             Kirigami.FormData.isSection: true
         }