Iván Ernesto Pérez Vargas (born June 29, 1971 in Havana) is a water polo player from Spain. He was born in Cuba, but became a Spanish citizen. He was a member of the national team that finished in sixth place at the 2004 Summer Olympics in Athens, Greece.
In 2003 Pérez, a player from CN Barcelona, ended up in fifth place with the national side at the 2003 World Aquatics Championships in his home town of Barcelona. He twice won the world title with Spain, at the 1998 World Aquatics Championships in Perth, Western Australia and at the 2001 World Aquatics Championships in Fukuoka, Japan.