The Rey de Reyes 2008 was the 12th annual Rey de Reyes professional wrestling tournament and show, produced by the Mexican wrestling promotion Asistencia Asesoría y Administración (AAA). The event took place on March 18, 2007 in the Plaza de Toros Lorenzo Garza arena in Monterrey, Nuevo León, Mexico. The main focus of the 2008 Rey de Reyes show was the twelfth annual Rey de Reyes tournament and a match between the top technico Cibernético and the top rudo El Mesias for the AAA Mega Championship which El Mesias held going into the event. The undercard included four qualifying matches for the Rey de Reyes leading to the traditional four man elimination match that led to the crowning of that year's Rey de Reyes. The undercard also saw the continuing feud between Konnan’s La Legión Extranjera and their altercations with wrestlers defending AAA. For this event La Legión Extranjera brought in two American wrestlers, Sabu and Scott Steiner, to strengthen their side. The other undercard storyline was that of Los Psycho Circus competing with The Black Family.

The AAA Mega Championship is a professional wrestling world heavyweight championship in the Mexican Lucha Libre AAA Worldwide (AAA) promotion. Known officially in Spanish as the Mega Campeonato AAA, it is sometimes referred to in the English-language press as the "AAA World Heavyweight Championship". The title is the top championship of the AAA promotion. The current champion is Nic Nemeth, who is in his first reign. He defeated Alberto El Patrón at Triplemanía XXXII: Monterrey on April 27, 2024 in Monterrey, Mexico.