Glen Dawson (June 3, 1912 – March 22, 2016) was an American rock climber, mountaineer, antiquarian bookseller, publisher and environmentalist.
His father, Ernest Dawson, was also a climber, antiquarian bookseller, and Sierra Club leader, who served as Sierra Club president from 1934 - 1937. Glen climbed White Mountain Peak in 1927. In 1928, Glen and his father climbed the Matterhorn with two Swiss guides.
In 1929, Dawson began serious mountaineering in the Sierra Nevada. With John Nixon and experienced climber Bill Horsfall, he climbed Mount Abbot, Mount Mills, Mount Humphreys, and the (later named) Clyde Minaret.
On July 6, 1930, during the Sierra Club's annual High Trip, he first teamed up with Jules Eichorn to make the third ascent of Red-and-White Mountain in the Sierra. They continued at a fast pace to climb Mount Abbot, Bear Creek Spire, Mount Dade, Turret Peak, Mount Darwin, The Hermit, Mount McGee, a first ascent of the (later named) Mount Mendel, Mount Goddard, Devils Crags, Mount Woodworth, Middle Palisade, Mount Sill, North Palisade, Polemonium Peak, Mount Winchell and Mount Agassiz. All of these climbs were completed in 24 days. Sierra Club Secretary Will Colby wrote, "Some youthful enthusiasts, including Glen Dawson, Jules Eichorn and John Olmstead, swarmed over everything that looked formidable in the way of a mountain peak."