diff --git a/DynamicIsland/Providers/CalendarServiceProviding.swift b/DynamicIsland/Providers/CalendarServiceProviding.swift
index b33ae40..055de25 100644
--- a/DynamicIsland/Providers/CalendarServiceProviding.swift
+++ b/DynamicIsland/Providers/CalendarServiceProviding.swift
@@ -146,6 +146,7 @@ class CalendarService: CalendarServiceProviding {
 extension CalendarModel {
     init(from calendar: EKCalendar) {
         self.init(
+            accountName: calendar.accountTitle,
             id: calendar.calendarIdentifier,
             title: calendar.title,
             color: calendar.color,
@@ -267,7 +268,7 @@ extension Priority {
 
 // MARK: - Helper Extensions
 
-private extension EKCalendar {
+extension EKCalendar {
     var accountTitle: String {
         switch source.sourceType {
         case .local, .subscribed, .birthdays:
diff --git a/DynamicIsland/components/Settings/SettingsView.swift b/DynamicIsland/components/Settings/SettingsView.swift
index ae7a5ec..a31e0c5 100644
--- a/DynamicIsland/components/Settings/SettingsView.swift
+++ b/DynamicIsland/components/Settings/SettingsView.swift
@@ -2905,18 +2905,48 @@ struct CalendarSettings: View {
                 }
 
                 Section(header: Text("Select Calendars")) {
-                    ForEach(calendarManager.allCalendars, id: \.id) { calendar in
-                        Toggle(isOn: Binding(
-                            get: { calendarManager.getCalendarSelected(calendar) },
-                            set: { isSelected in
-                                Task {
-                                    await calendarManager.setCalendarSelected(calendar, isSelected: isSelected)
+                    let grouped = Dictionary(grouping: calendarManager.allCalendars, by: \.accountName)
+                    let sortedAccounts = grouped.keys.sorted()
+
+                    ForEach(sortedAccounts, id: \.self) { account in
+                        let accountCalendars = grouped[account] ?? []
+                        let allAccountSelected = accountCalendars.allSatisfy { calendarManager.getCalendarSelected($0) }
+
+                        Section(header: HStack {
+                            Text(account)
+                            Spacer()
+                            Toggle("", isOn: Binding(
+                                get: { allAccountSelected },
+                                set: { isSelected in
+                                    Task {
+                                        await calendarManager.setCalendarsSelected(accountCalendars, isSelected: isSelected)
+                                    }
                                 }
+                            ))
+                            .labelsHidden()
+                            .toggleStyle(.switch)
+                            .controlSize(.mini)
+                            .disabled(!showCalendar)
+                        }) {
+                            ForEach(accountCalendars, id: \.id) { calendar in
+                                Toggle(isOn: Binding(
+                                    get: { calendarManager.getCalendarSelected(calendar) },
+                                    set: { isSelected in
+                                        Task {
+                                            await calendarManager.setCalendarSelected(calendar, isSelected: isSelected)
+                                        }
+                                    }
+                                )) {
+                                    HStack(spacing: 8) {
+                                        Circle()
+                                            .fill(Color(calendar.color))
+                                            .frame(width: 8, height: 8)
+                                        Text(calendar.title)
+                                    }
+                                }
+                                .disabled(!showCalendar)
                             }
-                        )) {
-                            Text(calendar.title)
                         }
-                        .disabled(!showCalendar)
                     }
                 }
             }
diff --git a/DynamicIsland/managers/CalendarManager.swift b/DynamicIsland/managers/CalendarManager.swift
index 1d84c0b..42c66e3 100644
--- a/DynamicIsland/managers/CalendarManager.swift
+++ b/DynamicIsland/managers/CalendarManager.swift
@@ -382,6 +382,36 @@ class CalendarManager: ObservableObject {
         lastEventsFetchDate = Date()
     }
 
+    func setCalendarsSelected(_ calendars: [CalendarModel], isSelected: Bool) async {
+        var selectionState = Defaults[.calendarSelectionState]
+        let ids = Set(calendars.map { $0.id })
+
+        switch selectionState {
+        case .all:
+            if !isSelected {
+                let identifiers = Set(allCalendars.map { $0.id }).subtracting(ids)
+                selectionState = .selected(identifiers)
+            }
+        case .selected(var identifiers):
+            if isSelected {
+                identifiers.formUnion(ids)
+            } else {
+                identifiers.subtract(ids)
+            }
+
+            if identifiers.isEmpty || identifiers.count == allCalendars.count {
+                selectionState = .all
+            } else {
+                selectionState = .selected(identifiers)
+            }
+        }
+
+        Defaults[.calendarSelectionState] = selectionState
+        updateSelectedCalendars()
+        await updateEvents(force: true)
+        await updateLockScreenEvents(force: true)
+    }
+
     func setReminderCompleted(reminderID: String, completed: Bool) async {
         await calendarService.setReminderCompleted(reminderID: reminderID, completed: completed)
         await updateEvents(force: true)
diff --git a/DynamicIsland/managers/LockScreenWidgetPreviewManager.swift b/DynamicIsland/managers/LockScreenWidgetPreviewManager.swift
index 9ac2c2a..7c3b5c0 100644
--- a/DynamicIsland/managers/LockScreenWidgetPreviewManager.swift
+++ b/DynamicIsland/managers/LockScreenWidgetPreviewManager.swift
@@ -302,6 +302,7 @@ final class LockScreenWidgetPreviewManager: ObservableObject {
     private func applyCalendarPreviewEvents() {
         let now = Date()
         let reminderCalendar = CalendarModel(
+            accountName: "Preview",
             id: "preview.reminders",
             title: "Reminders",
             color: .systemBlue,
@@ -327,6 +328,7 @@ final class LockScreenWidgetPreviewManager: ObservableObject {
         )
 
         let eventCalendar = CalendarModel(
+            accountName: "Preview",
             id: "preview.calendar",
             title: "Calendar",
             color: .systemOrange,
diff --git a/DynamicIsland/models/CalendarModel.swift b/DynamicIsland/models/CalendarModel.swift
index dd6e8b0..132ec3b 100644
--- a/DynamicIsland/models/CalendarModel.swift
+++ b/DynamicIsland/models/CalendarModel.swift
@@ -23,6 +23,7 @@
 import Cocoa
 
 struct CalendarModel: Identifiable, Hashable {
+    let accountName: String
     let id: String
     let title: String
     let color: NSColor