AAAA may refer to:

• AAAA battery, a 1.5 volt battery, smaller than the AAA size
• AAAA protocol, wihtin computer security, "authentication, authorization, accounting and auditing" - the AAA protocol combined with auditing.
• AAAA record, also known as 'IPv6 address record', maps a hostname to a 128-bit IPv6 address in the Domain Name System (DNS)
• Associated Actors and Artistes of America, an association of the performer trade unions Actors' Equity, AFTRA, Agma and Agva.
• American Association of Advertising Agencies
• In baseball slang, a player who is too good for Minor League Baseball, but not good enough for Major League Baseball
• Internet Authentication Service as an acronym for the four main services provided: Authentication, Authorization, Accounting, and Auditing