Jason Moses Estrada (born November 30, 1980) is an American former professional boxer who competed from 2004 to 2015.

Known as "Big Six", Estrada turned professional in 2004 and won fifteen of his first sixteen bouts, with one no-contest.

Jason lost by decision to 2004 Olympic Gold Medalist Alexander Povetkin on April 4, 2009 in Düsseldorf, Germany.

Estrada owns Big Six Boxing Academy in Providence, Rhode Island and co-trained Sam Hyde for his victorious debut on the undercard of 2 Fights 1 Night in 2022.

Estrada's results as a United States super heavyweight representative at the 2004 Athens Olympics were: