WhatsApp quickly and easily recognizes which of your contacts are using WhatsApp by accessing your phone's address book. To delete a contact, simply delete their phone number from your phone's address book:

1. Open WhatsApp and go to the Chats tab.
2. Tap the new chat icon > Find the contact and tap it > Tap the contact's name at the top.
3. Tap Edit > Scroll to the bottom and tap Delete Contact.

Deleting a contact from your phone's address book won't delete the chat history you have with them. You can find out how to delete a chat in this article.

Learn how to delete a contact on: Android | Windows Phone