Óscar Hernández Pérez (born April 10, 1978 in Barcelona, Spain) is a former professional male tennis player from Spain. He turned pro in 1998 and achieved his career-high singles ranking of World No. 48 in October 2007. Hernández scored an upset in the first round of the 2007 Rome Masters, when he defeated the World No. 20, Lleyton Hewitt, 3–6, 7–6(3), 6–1. Hernández announced his retirement from tennis on July 22, 2011.