Remove your account from:

Enter the name of the social network

How to delete a Steam account?

Delete your Steam account

The description of the service:

Steam is a digital distribution platform developed by Valve Corporation offering digital rights management, multiplayer gaming and social networking services.

Deletion complexity:

Not possible

If you contact Steam support, they will most likely tell you just to not use the account. If your account has no games on it, it will be disabled after a while.

Direct links to delete: