- Tahiti Swallow
- Taiga Bean Goose
- Tasman Sea Island Thrush
- Tataupa Tinamou
- Tawny-breasted Honeyeater
- Tawny-capped Euphonia
- Tawny-crested Tanager
- Tawny-shouldered Blackbird
- Tawny-throated Dotterel
- Tawny-throated Leaftosser
- Tawny Antpitta
- Tennessee Warbler
- Thamnornis
- Thick-billed Euphonia
- Thick-billed Green Pigeon
- Thick-billed Kingbird
- Thick-billed Murre
- Thick-billed Siskin
- Thorn-tailed Rayadito
- Three-banded Plover
- Three-striped Warbler
- Thrush-like Antpitta
- Thrush-like Wren
- Tibetan Babax
- Tibetan Lark
- Tibetan Rosefinch
- Tit-like Dacnis
- Tit Berrypecker
- Toco Toucan
- Torrent Duck
- Torrent Flyrobin
- Torrent Tyrannulet
- Torresian Crow
- Torresian Imperial Pigeon
- Toucan Barbet
- Townsend's Warbler
- Tractrac Chat
- Transvolcanic Jay
- Tree Swallow
- Tricolored Heron
- Tricolored Munia
- Tropical Gnatcatcher
- Tropical Kingbird
- Tropical Mockingbird
- Tropical Parula
- Tropical Royal Flycatcher
- Trumpeter Hornbill
- Trumpeter Swan
- Tufted Puffin
- Tufted Tit-Tyrant
- Tufted Titmouse
- Tui Parakeet
- Tumbes Pewee
- Tundra Bean Goose
- Tundra Swan
- Turkey Vulture
- Turquoise-browed Motmot
- Turquoise-fronted Amazon
- Turquoise Flycatcher
- Turquoise Jay
- Turquoise Tanager
- Twite
- Two-banded Plover
- Two-banded Warbler
- Two-barred Crossbill
- Tyrian Metaltail