- Tacazze Sunbird
- Taczanowski's Ground Tyrant
- Taiga Bean Goose
- Taiga Flycatcher
- Taita Fiscal
- Taita White-eye
- Talamanca Hummingbird
- Tambourine Dove
- Tanzanian Masked Weaver
- Tanzanian Red-billed Hornbill
- Tasmanian Nativehen
- Tasmanian Scrubwren
- Tasmanian Thornbill
- Tataupa Tinamou
- Taveta Weaver
- Tawny-bellied Babbler
- Tawny-bellied Hermit
- Tawny-bellied Screech Owl
- Tawny-bellied Seedeater
- Tawny-breasted Honeyeater
- Tawny-browed Owl
- Tawny-capped Euphonia
- Tawny-crested Tanager
- Tawny-flanked Prinia
- Tawny-headed Swallow
- Tawny Antpitta
- Tawny Eagle
- Tawny Frogmouth
- Tawny Grassbird
- Tawny Pipit
- Temminck's Babbler
- Temminck's Courser
- Temminck's Stint
- Temminck's Sunbird
- Temminck's Tragopan
- Tenerife Blue Chaffinch
- Tennessee Warbler
- Terek Sandpiper
- Terrestrial Brownbul
- Tessmann's Flycatcher
- Thamnornis
- Thekla's Lark
- Thick-billed Cuckoo
- Thick-billed Euphonia
- Thick-billed Flowerpecker
- Thick-billed Grasswren
- Thick-billed Green Pigeon
- Thick-billed Heleia
- Thick-billed Kingbird
- Thick-billed Longspur
- Thick-billed Miner
- Thick-billed Murre
- Thick-billed Raven
- Thick-billed Saltator
- Thick-billed Seed Finch
- Thick-billed Seedeater
- Thick-billed Spiderhunter
- Thick-billed Weaver
- Three-banded Courser
- Three-banded Plover
- Three-streaked Tchagra
- Three-striped Hemispingus
- Three-striped Warbler
- Three-toed Jacamar
- Three-toed Parrotbill
- Thrush-like Wren
- Tibetan Lark
- Tibetan Sand Plover
- Tibetan Sandgrouse
- Tibetan Serin
- Tickell's Blue Flycatcher
- Tickell's Leaf Warbler
- Tickell's Thrush
- Tiger Shrike
- Timor Blue Flycatcher
- Timor Boobook
- Timor Cuckoo-Dove
- Timor Friarbird
- Timor Leaf Warbler
- Timor Oriole
- Timor Sparrow
- Timor Stubtail
- Tinkling Cisticola
- Tiny Cisticola
- Tiny Sunbird
- Tit Berrypecker
- Tit Hylia
- Toco Toucan
- Tocuyo Sparrow
- Tody Motmot
- Tolima Blossomcrown
- Tolima Dove
- Tomtit
- Tooth-billed Hummingbird
- Tooth-billed Tanager
- Toro Olive Greenbul
- Torotoroka Scops Owl
- Torrent Duck
- Torrent Tyrannulet
- Torresian Crow
- Torresian Imperial Pigeon
- Torresian Kingfisher
- Toucan Barbet
- Tourmaline Sunangel
- Townsend's Solitaire
- Townsend's Warbler
- Tractrac Chat
- Tree Martin
- Tree Pipit
- Tricolored Heron
- Tricolored Munia
- Trilling Cisticola
- Trinidad Euphonia
- Trocaz Pigeon
- Tropical Boubou
- Tropical Gnatcatcher
- Tropical Kingbird
- Tropical Mockingbird
- Tropical Parula
- Tropical Royal Flycatcher
- Tropical Royal Flycatcher (mexicanus)
- Tropical Screech Owl
- Tropical Scrubwren
- Trumpeter Finch
- Trumpeter Hornbill
- Tsavo Sunbird
- Tschudi's Tapaculo
- Tufted Antshrike
- Tufted Duck
- Tufted Tit-Tyrant
- Tui
- Tumbes Hummingbird
- Tumbes Sparrow
- Tumbes Swallow
- Tumbes Tyrant
- Tumbesian Tyrannulet
- Tundra Swan
- Turati's Boubou
- Turkey Vulture
- Turner's Eremomela
- Turquoise-browed Motmot
- Turquoise-crowned Hummingbird
- Turquoise-fronted Amazon
- Turquoise Dacnis
- Turquoise Flycatcher
- Turquoise Jay
- Turquoise Tanager
- Twelve-wired Bird-of-paradise
- Twite
- Two-barred Warbler
- Tylas Vanga
- Tyrian Metaltail