Sergio Souto Vidal (born Oviedo, 4 November 1976) is a Spanish rugby union player.

His twin brother Carlos Souto was also a Spanish international.

He was part of the 1999 Rugby World Cup roster and played in the match against Uruguay, at Galashiels.

His last international match was against Romania, at Bucharest, on March 19, 2011.

This biographical article relating to Spanish rugby union is a stub.