Open the Contacts app or the Phone app and tap Contacts
Tap and hold a contact, then tap Share Contact if needed to select multiple contacts through a third-party app or iCloud on a computer
Use iCloud.com on a computer and sign in with your Apple ID
Open Contacts on iCloud.com
Hold Command on Mac or Control on Windows and click each contact you want to delete
Press Delete on the keyboard or click the Delete icon
Confirm the deletion
On iPhone, open Settings
Tap your Apple ID name
Tap iCloud
Turn Contacts off if you want to stop syncing deleted contacts back to the iPhone
Open the Contacts app and delete individual contacts one by one if needed
Use a third-party contact manager app from the App Store that supports bulk deletion