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. On club level he played for CN Sabadell in Spain.

See also List of world champions in men's water polo List of World Aquatics Championships medalists in water polo

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