| Santiago Fonseca | |
| Nationality: | Honduran |
| Sport: | Athletics |
| Event: | Racewalking |
| Birth Date: | 30 December 1953 |
Santiago Fonseca (born 30 December 1953) is a Honduran racewalker. He competed in the men's 20 kilometres walk at the 1976, 1984 and the 1988 Summer Olympics.[1] Fonseca was the flag bearer for Honduras in the Seoul 1988 opening ceremony.[2]