ICQ heard our complaints. As of now, it’s possible to delete your ICQ account! Hooray. Just use the direct link provided below and follow the instructions.
Direct removal link: http://www.icq.com/delete-account/
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for ICQ using a third-party login such as Facebook or Twitter, you probably want to revoke all access from ICQ. Click here to find out how.