Encyclopedias, Almanacs, Transcripts, and Maps
- Tuatara Lizard
- Tuatara: Sphenodontidae
- Tubby, Gertrude Ogden (1878-1967)
- Tubenosed Seabirds: Procellariiformes
- Tuberous Sclerosis Complex
- Tuco-Tucos: Ctenomyidae
- Tullio Levi-Civita
- Tulpa
- Tumah
- Tumo
- Tumor Viruses
- Tunisa
- Turacos and Plantain Eaters: Musophagiformes
- Turbellarians: Turbellaria
- Turing Tests
- Turkeys
- Turkeys
- Turner, M(alcolm) E(lijah) (1929-)
- Turoff, Stephen
- Turtles