- Taczanowski's Ground Tyrant
- Taiga Bean Goose
- Taiga Flycatcher
- Tawny-bellied Screech Owl
- Tawny-flanked Prinia
- Tawny-shouldered Blackbird
- Tawny-winged Woodcreeper
- Tawny Antpitta
- Tawny Eagle
- Tawny Owl
- Tawny Pipit
- Temminck's Lark
- Thekla's Lark
- Thick-billed Euphonia
- Thick-billed Murre
- Thick-billed Seed Finch
- Thick-billed Vireo
- Three-banded Plover
- Three-striped Flycatcher
- Three-striped Warbler
- Torrent Duck
- Torrent Tyrannulet
- Toucan Barbet
- Tourmaline Sunangel
- Tractrac Chat
- Tricolored Heron
- Tristram's Bunting
- Trocaz Pigeon
- Tropical Gnatcatcher
- Tropical Kingbird
- Tropical Parula
- Tropical Screech Owl
- Tufted Duck
- Tufted Tit-Spinetail
- Tufted Tit-Tyrant
- Tundra Swan
- Turkey Vulture
- Turquoise-browed Motmot
- Twite
- Two-barred Warbler
- Tyrian Metaltail