| Gustavo Marcos | |
| Fullname: | Gustavo Marcos Herrero |
| Nationality: |  Spain |
| Birth Date: | 23 December 1972 |
| Birth Place: | Barcelona, Spain |
| Height: | 1.8m (05.9feet) |
| Weight: | 95kg (209lb) |
| Position: | centre back |
| Years1: | ?-? |
| Clubs1: | CN Sabadell |
| Nationalyears1: | ?-? |
| Nationalteam1: | Spain |
| Show-Medals: | yes |
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.