The Arizona Complex League Athletics are a Minor League Baseball team based in Mesa, Arizona, which plays as a Rookie-level team in the Arizona Complex League and has served as a farm team for the Athletics organization since 1988. They play their home games at Fitch Park, the minor league spring training camp of the Athletics. The team is composed mainly of players who are in their first year of professional baseball either as draftees or non-drafted free agents from the United States, Canada, Dominican Republic, Venezuela, and other countries.

The team first competed in the Arizona League (AZL) in 1988, and has been a member of the league continuously since then. During the 2019 season, the team fielded two squads in the league, differentiated by Green and Gold suffixes. Prior to the 2021 season, the Arizona League was renamed as the Arizona Complex League (ACL).