| Guilherme Marques | |
| Fullname: | Guilherme Luiz Marques |
| Birth Place: | Juiz de Fora, Brazil |
| Height: | 6'4" |
Guilherme Luiz Marques (born June 26, 1969) is a Brazilian retired male beach volleyball player who won the gold medal at the 1997 World Championships in Los Angeles, California, partnering with Rogerio Ferreira. Two years later, the couple claimed the bronze medal at the World Championships in Marseille, France.