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- Steph Davis (born ?) USA. Second female one-day free climb El Capitan.
- Johnny Dawes (born 1964) UK. Rock climber, introduced two new grades in British grading system.
- José Antonio Delgado (1965–2006) Venezuela. Five 8,000m summits (1994–2006). Died on Nanga Parbat.
- Catherine Destivelle (born 1960) France. First woman to solo the Eiger North Face in winter.
- Clinton Thomas Dent (1850–1912) UK. Caucasus, Alps, first ascent Lenzspitze (1870), Aiguille du Dru (1878).
- Ardito Desio (1897–2001) Italy. Geologist and mountaineer. Leader, K2 first-ascent expedition (1954).
- Kurt Diemberger (born 1932) Austria. First ascent Broad Peak (1957) and Dhaulagiri (1960). Climbed K2 (1986 K2 disaster).
- Hans Christian Doseth (1958–1984) Norway. Climbed Great Trango Tower east face (1984). Died during descent.
- Lord Francis Douglas (1847–1865) Scotland. Died on descent after first ascent of Matterhorn.
- Hans Dülfer (1892–1915) Germany. Rock climber killed in World War I.
- Hayatullah Khan Durrani (born 1962) Pakistan. Mountaineer and rock climber.
- Günther Dyhrenfurth (1886–1975) Germany/Switzerland. Himalayan explorer. Led German expeditions to Kanchenjunga (1930, 1931).
Read more about this topic: List Of Climbers And Mountaineers