- Ocellated Turkey
- Ochre-breasted Antpitta
- Olivaceous Woodcreeper
- Olive-backed Oriole
- Olive-throated Parakeet
- Olive Bee-eater
- Opal-rumped Tanager
- Orange-bellied Euphonia
- Orange-breasted Fruiteater
- Orange-cheeked Parrot
- Orange-winged Amazon
- Orchard Oriole
- Oriental Dollarbird
- Ornate Flycatcher
- Osprey
- Osprey (cristatus)