How to remove your IMDb account
Be logged in and use the removal link. What will be removed, apart from your account information: ‘your vote history and My Movies information. This cannot be reversed so please be sure that you really want to do this.’
Direct removal link: https://secure.imdb.com/register-imdb/delete
Helpful Trick: Removing online data
Publicly visible text/images often aren’t properly removed even when you succeed in removing an account. Try editing or removing them manually before removing the account itself. If you’re unsure what happens to your tracks: this can be found mostly in the Terms of Service/Privacy Policy; otherwise you can always contact IMDb and ask personally. By the way, removal requests don’t necessarily mean your data will actually be removed (e.g. due to legal obligations).
Helpful Trick: Remove third-party logins
If you signed up for IMDb using a third-party login such as Facebook or Twitter, you probably want to revoke all access from IMDb. Click here to find out how.