Encyclopedias, Almanacs, Transcripts, and Maps
- True Bugs
- True Bugs, Cicadas, and Relatives: Hemiptera
- True Eels
- True Eels
- True Flies
- True Flies
- True Frogs: Ranidae
- True Seals: Phocidae
- True Toads, Harlequin Frogs, and Relatives: Bufonidae
- True World Order (TWO)
- Trumpeters: Psophiidae
- Trumpetfish
- Trumpetfish
- Truth Journal
- Truzzi, Marcello (1935-)
- Ts'ai Lun
- Tseng Jung-Liang (Zeng Gung-lyang)
- Tsiolkovsky, Konstantin
- Tsu Ch'ung-chih (Zu Chongzhi)
- Tuatara Lizard