The AAA World Heavyweight Championship is a professional wrestling world heavyweight championship in the Mexican wrestling promotion, Asistencia Asesoría y Administración (AAA). Known officially in Spanish as the Mega Campeonato AAA, it is sometimes referred to in English press as the "AAA World Heavyweight Championship". The title is currently the top championship of the AAA promotion.
The title was established in 2007 via a single elimination tournament billed as the "Torneo Campeón de Campeones,” or Champion of Champions Tournament, which effectively unified the International Wrestling Council World Heavyweight Championship, the Grand Prix Championship Wrestling SUPER-X Monster Championship, the Mexican National Heavyweight Championship, and the Universal Wrestling Association World Light Heavyweight Championship. The tournament field included the four reigning champions of the aforementioned titles as well as the four number one contenders to each respective championship. "El Mesías" Ricky Banderas, who entered the tournament as the IWC World Heavyweight Champion, became the inaugural AAA Mega Champion upon defeating the UWA World Light Heavyweight Champion entrant Chessman in the finals.
On 2011, the AAA World Champion and TNA founder Jeff Jarrett appeared with a redesigned version of the title in TNA program, Impact Wrestling, which was called simply Mexican Heavyweight Championship, due to AAA not sanctioning their championships for TNA television.