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- Twentieth century99
- Tyndale, William, -1536. Souper of the Lorde1
- Typhoid fever--Treatment1
- Typology (Theology)2
- Tzeltal language1
- Tzeltal language--Grammar1
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- Tzutuhil language--Grammar1
- Tāfilātī, Muḥammad ibn Muḥammad, d. 1777. Taʼnīs al-fuʼād bi-takhmīs Bānat Suʻād1
- Tārīkh Baghdād (Khaṭīb al-Baghdādī, Abū Bakr Aḥmad ibn ʻAlī)1
- Tārīkh al-Yamīnī (ʻUtbī, Muḥammad ibn ʻAbd al-Jabbār)1
- Tīrthaṅkaras7
- Tūnī, ʻAbd Allāh ibn Muḥammad, -1660 or 1661. Wāfiyah2
- Ugo, Giacoma di1
- Ugo, Piero di1
- Ugolino, Lodovico di1
- Uguccioni, Benedetto2