Delete your account from YouTube

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Yahoo

By doing following steps your YouTube account will be permanently removed. You will not be be able to reopen your account once it's deleted.

Navigate to http://www.youtube.com/my_account_delete
If you are not logged on, you will be redirected to the login page. Enter your login data if necessary.
Enter your password and the reason of deleting your account. Reason is required entry.
Click on 'Delete My Account'