| Sierra de Vallejo Biosphere Reserve | |
| Location: | Nayarit, Mexico |
| Nearest City: | Puerto Vallarta |
| Area Km2: | 549.35 |
| Designation: | Biosphere reserve |
| Established: | 2004 |
Sierra de Vallejo Biosphere Reserve is a protected natural area of western Mexico. It protects the Sierra de Vallejo, a Pacific coastal mountain range in southern Nayarit state. The reserve was established in 2004, and covers an area of 549.35 km2.[1]