- Taczanowski's Ground Tyrant
- Taiga Bean Goose
- Tawny-bellied Screech Owl
- Tawny-breasted Myiobius
- Tawny-chested Flycatcher
- Tawny-crested Tanager
- Tawny-crowned Greenlet
- Tawny-crowned Pygmy Tyrant
- Tawny-winged Woodcreeper
- Tawny Owl
- Tawny Pipit
- Tawny Tit-Spinetail
- Temminck's Stint
- Tennessee Warbler
- Thekla's Lark
- Thick-billed Euphonia
- Thick-billed Murre
- Thick-billed Seed Finch
- Thorn-tailed Rayadito
- Three-striped Hemispingus
- Three-striped Warbler
- Thrush-like Wren
- Tit-like Dacnis
- Titicaca Grebe
- Toco Toucan
- Tody Motmot
- Torrent Duck
- Torrent Tyrannulet
- Toucan Barbet
- Tourmaline Sunangel
- Townsend's Warbler
- Tree Pipit
- Tricolored Brushfinch
- Tricolored Heron
- Trilling Gnatwren
- Trocaz Pigeon
- Tropical Gnatcatcher
- Tropical Kingbird
- Tropical Parula
- Tropical Pewee
- Tropical Screech Owl
- Tschudi's Woodcreeper
- Tufted Duck
- Tufted Tit-Spinetail
- Tufted Tit-Tyrant
- Tumbes Hummingbird
- Tumbes Sparrow
- Tumbes Tyrant
- Tundra Swan
- Turkey Vulture
- Turquoise Jay
- Twite
- Two-banded Plover
- Tyrian Metaltail