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- Louis Lachenal (1921–1955) France. First ascent of Annapurna 1950, with Maurice Herzog. Died skiing in Chamonix.
- Jean-Christophe Lafaille (1965–2006) France. 11 eight-thousanderswithout supplementary oxygen. Died on Makalu.
- Raymond Lambert (1914–1997) Switzerland. Reached 8611m, highest altitude at that time, with 1952 Swiss Everest expedition.
- Samantha Larson (born 1988) USA. Youngest person to complete Seven Summits, at 18 (2007).
- Philip Ling (born ?) Australia. Notorious for one of the highest rescue of two injured Sherpas on Mt. Pumori (7167m), Nepal.
- Pete Livesey (1943–1998) UK. Influential rock climber (1970s).
- John Long (born 1953) USA. Rock climber and writer. Author of How to Rock Climb series.
- Erhard Loretan (1959–2011) Switzerland. 14 8,000m plus summits (1982–1995).
- Alex Lowe (1958–1999) USA. Great Trango Tower, Rakekniven - Antarctica & Sail Peak - Baffin Island. Died on Shishapangma.
- Fritz Luchsinger (1921–1983) Switzerland. First ascent Lhotse (1956).
Read more about this topic: List Of Climbers And Mountaineers