Arena Naucalpan 25th Anniversary Show

The Arena Naucalpan 25th Anniversary Show was a major annual professional wrestling event produced and scripted by the Mexican professional wrestling promotion International Wrestling Revolution Group (IWRG), which took place on December 19, 1998 in Arena Naucalpan, Naucalpan, State of Mexico, Mexico. As the name implies the show celebrated the 25th anniversary of the construction of Arena Naucalpan, IWRG's main venue in 1977. The show is IWRG's longest-running show, predating IWRG being founded in 1996 and is the fourth oldest, still held, annual show in professional wrestling.

The only verified match of the show is the main event, a Lucha de Apuestas, or "bet match" between Hijo del Santo and Scorpio Jr. where Scorpio Jr. was forced to have all his hair shaved off as a result of his loss. The main event was a rematch from the Arena Naucalpan 22nd Anniversary Show where the two faced off for the "Millennium Cup" trophy. Due to incomplete record keeping, no other match results have been verified.