Gustavo Marcos Herrero (born 23 December 1972) is a Spanish male water polo player in the late '90s and early '00s.

He was a member of the Spain men's national water polo team, playing as a centre back.

He was a part of the team at the 2000 Summer Olympics and 2004 Summer Olympics.

[1] On club level he played for CN Sabadell in Spain.

This biographical article relating to a Spanish water polo figure is a stub.