iCloud User Guide
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Delete a contact on iCloud.com
You can delete a contact completely from iCloud Contacts or remove it from a group.
WARNING: When you delete a contact, it’s deleted on every device that has iCloud Contacts turned on.
In Contacts on iCloud.com, do either of the following:
Delete a contact completely: Select the contact in the All Contacts list, press the Delete key, then click Delete.
Delete a contact from a group: Click the group on the left, select the contact, then press the Delete key.
Deleting a contact from a group removes it from that group only.
If your account has Screen Time communication limits turned on, you may not be able to delete contacts. See If you can’t create, import, edit, or delete contacts on iCloud.com.
If you accidentally delete any contacts, you can use iCloud.com to restore them. For instructions, see Restore contacts, calendars, bookmarks, and more using iCloud.com.