🟩 Google Calendar
In the top right, click the gear (⚙️) icon and select Settings.
Use the left hand menu and scroll down to Settings for other calendars.
Find the calendar you want to remove and expand it by clicking on it.
Select Remove Calendar.
At the bottom of the page, click Unsubscribe, then confirm by clicking Remove Calendar.
🟦 iCal (Apple Calendar)
Click the calendar’s name in the calendar list.
If you don’t see the list, go to View → Show Calendar List.
From the menu, choose Edit → Delete.
🟨 Outlook (Desktop App)
In Outlook, select Calendar from the navigation menu.
Right-click the internet calendar you want to remove.
Choose Delete Calendar from the sub-menu.
Click Yes to confirm the deletion.
🟧 Outlook.com (Web Version)
Click the gear (⚙️) icon in the top-right corner (just to the left of your name).
Choose Options.
Under Edit your reminder and calendar settings, click the calendar name you wish to delete to open its settings.
At the top of the page, click Delete.
✅ Result:
The selected calendar feed will be removed from your account, and its events will no longer appear in your calendar view.