Ernesto Peña Williams (born October 8, 1978, in Nueva Gerona) is a retired amateur Cuban Greco-Roman wrestler, who competed in the men's heavyweight category.

[1] He won the gold medal in the 96-kg division at the 2003 Pan American Games in Santo Domingo, Dominican Republic, and was later selected to the Cuban team for the 2004 Summer Olympics in Athens.

Pena emerged himself into the global scene at the 2001 World Wrestling Championships in Patras, Greece, where he picked up a silver medal on his first ever final match against Russia's Aleksandr Bezruchkin.

[5] In the preliminary pool, Pena upset U.S. wrestler and 2000 Olympic bronze medalist Garrett Lowney on his opening bout, and then threw out Hungary's Lajos Virág into the ring for a spot in the quarterfinals.

[6][7] Pena suffered his major defeat from Turkey's Mehmet Özal in the quarterfinal match on the next day's session, but offered a chance to redeem himself in the ring by ousting Kyrgyzstan's Gennady Chkhaidze for a fifth place finish.