| Name | Type |
|---|---|
| Look Out! Danger! (2013) | Article |
| Lorna Ream, 1930-2010 (2011) | Article |
| Los Gemelos, the Slash (2010) | Article |
| Lulie Nettleton, 1877-1960 (1960) | Article |
| Lyap Nazar, First Ski Descent (2019) | Article |
| M.I.T. Outing Club (1956) | Article |
| Macauley Letchfield Smith, 1905-1993 (1995) | Article |
| Manual of American Mountaineering (1942) | Article |
| Manuel d'Alpinisme (1934) | Article |
| Maria Cranor, 1946–2023 (2023) | Article |
| Mary Goddard Potter, 1865-1943 (1943) | Article |
| Max E. Friedmann, 1890-1954 (1954) | Article |
| Max Maurice Strumia, 1896–1972 (1972) | Article |
| Mazama Centennial, 1994 (1994) | Article |
| Mazamas (1957) | Article |
| Mazamas (1956) | Article |
| Mazamas (1964) | Article |
| Mazamas (1950) | Article |
| Melanphulan (6,573m), North Face (Not to Summit) (2010) | Article |
| Memphis Mountaineers (1987) | Article |