Emberizidae
- Blue-black Grassquit Volatinia jacarina
- Slate-colored Seedeater Sporophila schistacea
- Variable Seedeater Sporophila corvina
- White-collared Seedeater Sporophila torqueola
- Yellow-bellied Seedeater Sporophila nigricollis
- Ruddy-breasted Seedeater Sporophila minuta
- Nicaraguan Seed-Finch Oryzoborus nuttingi
- Thick-billed Seed-Finch Oryzoborus funereus
- Blue Seedeater Amaurospiza concolor
- Yellow-faced Grassquit Tiaris olivacea
- Cocos Island Finch Pinaroloxias inornata' Outlying islands only Vulnerable
- Slaty Finch Haplospiza rustica
- Peg-billed Finch Acanthidops bairdii
- Slaty Flowerpiercer Diglossa plumbea
- Grassland Yellow-Finch Sicalis luteola Rare/Accidental
- Wedge-tailed Grass-Finch Emberizoides herbicola
- Sooty-faced Finch Lysurus crassirostris
- Yellow-thighed Finch Pselliophorus tibialis
- Large-footed Finch Pezopetes capitalis
- White-naped Brush Finch Atlapetes albinucha
- Chestnut-capped Brush Finch Arremon brunneinucha
- Black-headed Brush Finch Arremon atricapillus
- Orange-billed Sparrow Arremon aurantiirostris
- Olive Sparrow Arremonops rufivirgatus
- Black-striped Sparrow Arremonops conirostris
- Prevost's Ground-Sparrow Melozone biarcuatum
- White-eared Ground-Sparrow Melozone leucotis
- Stripe-headed Sparrow Aimophila ruficauda
- Botteri's Sparrow Aimophila botterii
- Rusty Sparrow Aimophila rufescens
- Chipping Sparrow Spizella passerina Rare/Accidental
- Savannah Sparrow Passerculus sandwichensis Rare/Accidental
- Grasshopper Sparrow Ammodramus savannarum
- Lincoln's Sparrow Melospiza lincolnii Rare/Accidental
- Rufous-collared Sparrow Zonotrichia capensis
- Volcano Junco Junco vulcani
Read more about this topic: List Of Birds Of Costa Rica