The Arena Naucalpan 38th Anniversary Show was a major annual professional wrestling event produced by Mexican professional wrestling promotion International Wrestling Revolution Group (IWRG), which took place on December 20, 2015 in Arena Naucalpan, Naucalpan, State of Mexico, Mexico. The show celebrated the 38th Anniversary of the construction of Arena Naucalpan, IWRG's main venue. In the main event the team known as Los Insoportables ("The Unbearables"; Eterno and Apolo Estrada Jr.) defeated Los Terribles Cerebros ("The Terrible Brains"; Black Terry and Dr. Cerebro), as a result of their loss Black Terry and Dr. Cerebro had all their hair shaved off under Luchas de Apuestas rules. The show also saw El Hijo de Dos Caras successfully defend the IWRG Intercontinental Heavyweight Championship and Imposible successfully defend the IWRG Intercontinental Lightweight Championship.

Promoter Adolfo Moreno had promoted Lucha Libre, or professional wrestling in Naucalpan, State of Mexico, Mexico prior to financing the building of Arena Naucalpan that opened in late 1976. Originally Moreno worked together with the Universal Wrestling Association (UWA) and then later Consejo Mundial de Lucha Libre (CMLL) as a local promoter. On January 1, 1996 Moreno created International Wrestling Revolution Group (IWRG) as an independent promotion. IWRG celebrates the anniversary of Arena Naucalpan each year in December with a major show, making it the second oldest, still promoted show series in the world. pre-dating WrestleMania by eight years. Only the CMLL Anniversary Show series has a longer history. The 2015 Arena Naucalpan anniversary show will mark the 38th Anniversary of Arena Naucalpan. The Anniversary shows, as well as the majority of the IWRG shows in general are held in Arena Naucalpan.

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