I
- Instituto Nacional de Biodiversidad
- International Organization for Standardization (ISO)
- ISO 3166-1 alpha-2 country code for Costa Rica: CR
- ISO 3166-1 alpha-3 country code for Costa Rica: CRI
- ISO 3166-2:CR region codes for Costa Rica
- Irazú Volcano
- Islands of Costa Rica
- Isla Brava
- Isla Calero
- Isla Damas
- Isla del Caño
- Isla del Coco
- Isla San Lucas
Read more about this topic: Index Of Costa Rica-related Articles