Óliver Pérez Martinez (born August 15, 1981 in Culiacán, Sinaloa, Mexico) is a Major League Baseball left-handed starting pitcher for the New York Mets.

Oliver Pérez was signed by the San Diego Padres as an amateur free agent in 1999. He made his debut with the Padres in 2002. Pérez did well for a rookie after being called up by the Padres in 2002, striking out over a batter per inning, but he suffered from control issues at times. He regressed somewhat in 2003.

In August 2003, Pérez was sent by San Diego to Pittsburgh along with Jason Bay and Cory Stewart in the same trade that brought Brian Giles to the Padres. Pérez continued to struggle for his new team.