Ignacio "Nacho" Beristáin (born July 31, 1939, in Actopan, Veracruz, Mexico) is a Mexican trainer in the sport of boxing.

He later turned professional, but was forced to retire prematurely in 1959 due to an eye injury.

[3] As a trainer in the amateur ranks, he led Mexico's boxing teams to multiple medal wins at the 1968, 1976 and 1980 Olympic Games.

[4] His first professional world champion was two-division title holder and hall of famer Daniel Zaragoza.

[5] He has trained several other notable boxers, including hall of fame member brothers Juan Manuel Márquez and Rafael Márquez and other fellow hall of famers, such as Ricardo López, Gilberto Román, and Humberto "Chiquita" González, having trained them from their initial careers to the top of the pound for pound rankings.