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- Junko Tabei (born 1939) Japan. 1st female ascent Everest; 1st completion of Bass and Messner's Seven Summits.
- Aleksandra Taistra (born 1982) Poland. Fourth female 8c redpoint.
- Joe Tasker (1948–1982) UK. Dunagiri, Kanchenjunga, Changabang West Wall; died on Everest (May 1982).
- Lionel Terray (1921–1965) France. First ascent Makalu (1955); second ascent Eiger north face (1949).
- Vladislav Terzyul (1953–2004) Ukraine. Disputed claim to have climbed all eight-thousanders.
- Kevin Thaw (born 1967) UK. Ascents in Himalaya and Yosemite.
- Herbert Tichy (1912–1987) Austrian. First ascent Cho Oyu (1954).
- Bill Tilman (1898–1977) UK. Explorer, climbed in Africa and Himalaya. First ascent Nanda Devi.
- Luis Trenker (1892–1990) Italy. Mountaineer, film director and writer.
- Sonnie Trotter (born 1979) Canada. Award-winning climber, known for hard trad climbing.
- Francis Fox Tuckett (1834–1913) UK. First ascent Aletschhorn (1859).
- Julie Tullis (1939–1986) UK. Broad Peak (1984) and K2 (1986); died on descent from K2.
- Mark Twight (born 1962) USA. Advocate of "light and fast" style of mountaineering.
- John Tyndall (1820–1893) UK. Early attempts on Matterhorn, first ascent Weisshorn (1861).
Read more about this topic: List Of Climbers And Mountaineers