Delete a calendar on iCloud.com

When you delete a calendar on iCloud.com, all events associated with the calendar are also deleted.

WARNING: When you delete a calendar, it’s deleted from every device with Calendars turned on in iCloud settings.

You can’t delete all of the calendars in the list because the iCloud Calendar list must always contain at least one calendar.

Note: You need to be on a tablet or computer to use Calendar on iCloud.com.

Go to icloud.com/calendar, then sign in to your Apple Account (if necessary).
In the sidebar, tap the calendar (on a tablet) or hold your pointer over the calendar (on a Mac).
Select , then select Delete Calendar.

If you accidentally delete calendars or events, you can restore an archived version of your calendars. See Restore your calendars and events on iCloud.com.

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iCloud User Guide