| Sierra de San Juan Biosphere Reserve | |
|---|---|
 The Sierra de San Juan, with Tepic in the foreground | |
  | |
| Nearest city | Tepic |
| Coordinates | 21°28′30″N 104°57′45″W / 21.47500°N 104.96250°W |
| Area | 19,801 ha (76.45 sq mi) |
| Designated | 2003 |
The Sierra de San Juan Biosphere Reserve is a protected area in Nayarit state of western Mexico. It was established in 2003, and has an area of 198.01 km2.[1] It lies just southwest of the city of Tepic. It protects a portion of the Sierra de San Juan, a mountain range which lies between Tepic and the Pacific Ocean.