| San Antonio de Petrel | |
| Settlement Type: | Village |
| Official Name: | San Antonio de Petrel |
| Mapsize: | 300px |
| Mapsize1: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: |  Chile |
| Subdivision Type1: | Region |
| Subdivision Name1: | O'Higgins |
| Subdivision Name2: | Cardenal Caro |
| Subdivision Name3: | Pichilemu |
| Area Total Km2: | 147.4 |
| Population As Of: | 2002 |
| Population Total: | 371 |
| Population Density Km2: | 2.51 |
San Antonio de Petrel (Spanish for St. Anthony of Petrel, pronounced as /es/) is a small Chilean village located near the hacienda of the same name, in Pichilemu.[1] It is located 18km (11miles) east of Pichilemu.[1] According to the 2002 census, the population of San Antonio de Petrel comprised 371 people, and 94 households.[2]