diff --git a/src/prefs/koprefsdialog.h b/src/prefs/koprefsdialog.h
--- a/src/prefs/koprefsdialog.h
+++ b/src/prefs/koprefsdialog.h
@@ -29,6 +29,7 @@
 #include "kcmdesignerfields.h"
 #include <QSet>
 #include <Libkdepim/KPrefsDialog>
+#include <KColorButton>
 
 class QPushButton;
 
@@ -68,23 +69,27 @@
     void usrWriteConfig() override;
     void usrReadConfig() override;
 
+private Q_SLOTS:
+    void useSystemColorToggle(bool useSystemColor);
+    
 protected Q_SLOTS:
     void updateCategories();
     void setCategoryColor();
     void updateCategoryColor();
 
     void updateResources();
     void setResourceColor();
     void updateResourceColor();
-
+    
 private:
     KComboBox *mCategoryCombo = nullptr;
     KColorButton *mCategoryButton = nullptr;
     QHash<QString, QColor> mCategoryDict;
 
     Akonadi::CollectionComboBox *mResourceCombo = nullptr;
     KColorButton *mResourceButton = nullptr;
     QHash<QString, QColor> mResourceDict;
+    QList<KColorButton *> mButtonsDisable; // button that are disabled when using system color
 };
 
 class KCM_KORGANIZER_EXPORT KOPrefsDialogGroupScheduling : public KPIM::KPrefsModule
diff --git a/src/prefs/koprefsdialog.cpp b/src/prefs/koprefsdialog.cpp
--- a/src/prefs/koprefsdialog.cpp
+++ b/src/prefs/koprefsdialog.cpp
@@ -757,36 +757,51 @@
     QGridLayout *colorLayout = new QGridLayout(colorFrame);
     tabWidget->addTab(colorFrame, QIcon::fromTheme(QStringLiteral("preferences-desktop-color")),
                       i18nc("@title:tab", "Colors"));
-
-    // Holiday Color
-    KPIM::KPrefsWidColor *holidayColor
-        = addWidColor(KOPrefs::instance()->agendaHolidaysBackgroundColorItem(), colorFrame);
-    colorLayout->addWidget(holidayColor->label(), 0, 0);
-    colorLayout->addWidget(holidayColor->button(), 0, 1);
+    
+    // Use System color
+    KPIM::KPrefsWidBool *useSystemColorBool
+        = addWidBool(KOPrefs::instance()->useSystemColorItem(), colorFrame);
+        
+    QCheckBox* useSystemColorButton = useSystemColorBool->checkBox();
+    QObject::connect(useSystemColorButton, &QCheckBox::toggled,
+                     this, &KOPrefsDialogColorsAndFonts::useSystemColorToggle);
+    colorLayout->addWidget(useSystemColorBool->checkBox(), 1, 0, 1, 2);
 
     // agenda view background color
     KPIM::KPrefsWidColor *agendaBgColor
         = addWidColor(KOPrefs::instance()->agendaGridBackgroundColorItem(), colorFrame);
-    colorLayout->addWidget(agendaBgColor->label(), 3, 0);
-    colorLayout->addWidget(agendaBgColor->button(), 3, 1);
+    KColorButton *agendaBgColorButton = agendaBgColor->button();
+    mButtonsDisable.push_back(agendaBgColorButton);
+    colorLayout->addWidget(agendaBgColor->label(), 2, 0);
+    colorLayout->addWidget(agendaBgColorButton, 2, 1);
 
     KPIM::KPrefsWidColor *viewBgBusyColor
         = addWidColor(KOPrefs::instance()->viewBgBusyColorItem(), colorFrame);
-    colorLayout->addWidget(viewBgBusyColor->label(), 4, 0);
-    colorLayout->addWidget(viewBgBusyColor->button(), 4, 1);
+    KColorButton *viewBgBusyColorButton = viewBgBusyColor->button();
+    mButtonsDisable.push_back(viewBgBusyColorButton);
+    colorLayout->addWidget(viewBgBusyColor->label(), 3, 0);
+    colorLayout->addWidget(viewBgBusyColorButton, 3, 1);
 
+    // working hours color
+    KPIM::KPrefsWidColor *agendaGridWorkHoursBackgroundColor
+        = addWidColor(KOPrefs::instance()->workingHoursColorItem(), colorFrame);
+    KColorButton *agendaGridWorkHoursBackgroundColorButton = agendaGridWorkHoursBackgroundColor->button();
+    mButtonsDisable.push_back(agendaGridWorkHoursBackgroundColorButton);
+    colorLayout->addWidget(agendaGridWorkHoursBackgroundColor->label(), 4, 0);
+    colorLayout->addWidget(agendaGridWorkHoursBackgroundColor->button(), 4, 1);
+    
     // agenda view Marcus Bains line color
     KPIM::KPrefsWidColor *mblColor
         = addWidColor(KOPrefs::instance()->agendaMarcusBainsLineLineColorItem(), colorFrame);
     colorLayout->addWidget(mblColor->label(), 5, 0);
     colorLayout->addWidget(mblColor->button(), 5, 1);
 
-    // working hours color
-    KPIM::KPrefsWidColor *agendaGridWorkHoursBackgroundColor
-        = addWidColor(KOPrefs::instance()->workingHoursColorItem(), colorFrame);
-    colorLayout->addWidget(agendaGridWorkHoursBackgroundColor->label(), 6, 0);
-    colorLayout->addWidget(agendaGridWorkHoursBackgroundColor->button(), 6, 1);
-
+    // Holiday Color
+    KPIM::KPrefsWidColor *holidayColor
+        = addWidColor(KOPrefs::instance()->agendaHolidaysBackgroundColorItem(), colorFrame);
+    colorLayout->addWidget(holidayColor->label(), 6, 0);
+    colorLayout->addWidget(holidayColor->button(), 6, 1);
+    
     // Todo due today color
     KPIM::KPrefsWidColor *todoDueTodayColor
         = addWidColor(
@@ -938,6 +953,17 @@
     //mCalendarViewsPrefs->readConfig();
 }
 
+void KOPrefsDialogColorsAndFonts::useSystemColorToggle(bool useSystemColor)
+{
+    for (KColorButton *colorButton : mButtonsDisable) {
+        if (useSystemColor) {
+            colorButton->setEnabled(false);
+        } else {
+            colorButton->setEnabled(true);
+        }
+    }
+}
+
 void KOPrefsDialogColorsAndFonts::updateCategories()
 {
     updateCategoryColor();
diff --git a/src/settings/korganizer.kcfg b/src/settings/korganizer.kcfg
--- a/src/settings/korganizer.kcfg
+++ b/src/settings/korganizer.kcfg
@@ -563,6 +563,11 @@
       <whatsthis>Select the holiday color here. The holiday color will be used for the holiday name in the month view and the holiday number in the date navigator.</whatsthis>
       <default>255, 100, 100</default>
     </entry>
+    <entry type="Bool" key="Use System Color">
+      <label>Use system color</label>
+      <whatsthis>Use system color insteal of user defined color. If enabled will ignore all other color settings</whatsthis>
+      <default>true</default>
+    </entry>
     <entry key="Agenda Holidays Background Image" type="String">
     </entry>
     <!-- END:   These entries are the same for the agenda and month views, please keep them in sync -->