World Factbook
- T'bilisi (capital)
- Tadzhikistan (former name for Tajikistan)
- Tahiti (island)
- Taipei (capital)
- Taiwan Strait
- Tallinn (capital)
- Tanganyika (former name for the mainland portion of Tanzania)
- Tangier (city)
- Tannu-Tuva (region)
- Tarawa (island)
- Tartary, Gulf of
- Tashkent (capital)
- Tasmania (island)
- Tasman Sea
- Tatar Strait
- Taymyr Peninsula (Poluostrov Taymyr)
- Tchad (local name for Chad)
- Tegucigalpa (capital)
- Tehran (capital)
- Tel Aviv (capital, de facto)
- Teluk Bone (gulf)
- Teluk Tomini (gulf)
- Terre Adelie (claimed by France; also Adelie Land)
- Terres Australes et Antarctiques Francaises (local name for the French Southern and Antarctic Lands)
- Thailand, Gulf of
- The Former Yugoslav Republic of Macedonia
- Thessaloniki (city; also Salonika)
- Thimphu (capital)
- Thuringia (region)
- Thurston Island
- Tiberias, Lake
- Tibet (autonomous region; also Xizang)
- Tibilisi (see T'bilisi)
- Timor Lorosa'e (local name for Timor-Leste)
- Timor Sea
- Tinian (island)
- Tiran, Strait of
- Tirana, Tirane (capital)
- Tobago (island)
- Tokyo (capital)
- Tonkin, Gulf of
- Toronto (city)
- Torres Strait
- Torshavn (capital)
- Toshkent (see Tashkent)
- Transcarpathia (region; alternate name for Carpatho-Ukraine)
- Transjordan (former name for Jordan)
- Transkei (enclave)
- Transvaal (region; former name for northeastern South Africa)
- Transylvania (region)
- Trindade, Ilha de (island)
- Trinidad (island)
- Tripoli (capital)
- Tripoli (city)
- Tripolitania (region)
- Tristan da Cunha Group (island group)
- Trobriand Islands
- Tromelin Island
- Trucial Coast (former name for the United Arab Emirates)
- Trucial Oman (former name for the United Arab Emirates)
- Trucial States (former name for the United Arab Emirates)
- Truk Islands (former name for the Chuuk Islands)
- Tsugaru Strait
- Tuamotu Islands (Iles Tuamotu)
- Tubuai Islands (Iles Tubuai)
- Tunb al Kubra (island)
- Tunb as Sughra (island)
- Tunis (capital)
- Turin (city)
- Turkish Straits (see Bosporus and Dardenelles)
- Turkiye (local name for Turkey)
- Turkmenia, Turkmeniya (former name for Turkmenistan)
- Turks Island Passage
- Tuscany (region)
- Tutuila (island)
- Tyrrhenian Sea