Guanacaste can refer to:
- Guanacaste (tree), the common tropical American tree Enterolobium cyclocarpum
Places
Belize
- Guanacaste National Park (Belize), a small national park in Belize
Costa Rica
- Guanacaste Province, a province of Costa Rica
- Guanacaste National Park (Costa Rica), a small national park in Costa Rica
- Guanacaste Cordillera a mountain range in Costa Rica