Unified login or SUL (single user login) is a mechanism which allows users to use a single global login on all public Wikimedia Foundation projects. This allows users to maintain a consistent identity throughout Wikimedia and work on different projects without having to sign up and log in to each project individually.

• For information about unified login, see m:Help:Unified login
• To request a rename of your global account, see Special:GlobalRenameRequest
• To view your global account's contributions, see Special:CentralAuth
• To request your global account to be vanished, see Special:GlobalVanishRequest

• Single-User Login provides access to all wikis, an April 2015 entry on the Wikimedia Foundation blog
• mw:SUL finalisation (an inactive MediaWiki page, kept for historical interest, on the 2015 rationalization of usernames across all WMF wikis)
• Wikipedia:Changing username/Guidelines § Handling SUL conflicts
• Wikipedia:SUL/Consultation on renames (an inactive Wikipedia sub-page, kept for historical interest, on a discussion from 2008)