Sergio Valdés (born 17 September 1978) is a Chilean rugby union footballer. He plays as a lock. He moved to France, where he has been playing for Stade Aurillacois, Racing Métro 92 (2005-2007), FC Auch (2007-2011), Section Paloise (2011-2013) and SU Agen since 2013. Valdes is an international player for Chile.