| San Juan Petlapa | |
| Settlement Type: | Municipality and town |
| Pushpin Map: | Mexico |
| Pushpin Label Position: | above |
| Pushpin Map Caption: | Location in Mexico |
| Subdivision Type: | Country |
| Subdivision Name: |  Mexico |
| Subdivision Type1: | State |
| Subdivision Name1: | Oaxaca |
| Area Total Km2: | 253.89 |
| Population As Of: | 2005 |
| Population Total: | 2717 |
| Timezone: | Central Standard Time |
| Utc Offset: | -6 |
| Timezone Dst: | Central Daylight Time |
| Utc Offset Dst: | -5 |
| Coordinates: | 17.4667°N -98°W |
San Juan Petlapa is a town and municipality in Oaxaca in south-western Mexico. The municipality covers an area of 253.89 km². It is part of the Choapam District in the south of the Papaloapan Region.
As of 2005, the municipality had a total population of 2,717.[1] Among the population, 773 are Indigenous people.[2]