S
- Sabogal River
- Salto River
- San Carlos River
- San José, Costa Rica – Capital of Costa Rica
- San José Province
- San Juan River
- Sapoá River
- Sarapiquí River
- Saturnino Lizano Gutiérrez
- Savegre River
- Sierpe River
- Sixaola River
- Spanish colonization of the Americas
- Spanish language
- Sucio River
- Suerte River
Read more about this topic: Index Of Costa Rica-related Articles