Frederick Samuel Dellenbaugh (1853–1935) was an American explorer.
He was born in McConnelsville, Ohio and was educated in the United States and in Europe. An explorer of the American West at an early age, he was a member of an expedition that discovered the last unknown river in the United States, the Escalante River and the previously undiscovered Henry Mountains.
From 1871 to 1873, he was artist and assistant topographer with Major Powell's second expedition down the Colorado River. He joined the 1899 Harriman Alaska Expedition financed by railroad magnate E. H. Harriman. He served as librarian of the American Geographical Society (1909–1911), and became a fellow of the American Ethnological Society. He helped to found the Explorers Club in 1904.
Painting of Zion Canyon, by Dellenbaugh, 1903
- The North Americans of Yesterday (1900)
- The Romance of the Colorado River (1902; third edition, 1909)
- Breaking the Wilderness (1905)
- In the Amazon Jungle (1908); by Algot Lange (Introduction by Dellenbaugh)
- A Canyon Voyage (1908; second edition, 1926)
- Frémont and '49 (1913; second edition, 1914)
- George Armstrong Custer (1917)
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