Guyot, Arnold Henry (1807–1884), a Swiss-American geographer and geologist. Guyot wrote textbooks that helped popularize geology and geography in the United States. He investigated glaciers and created plans leading to the establishment of the U.S. Weather Bureau. Guyot received his Ph.D. from the University of Berlin in 1835. He came to the United States in 1848 at the urging of Louis Agassiz. In 1854 Guyot became a professor at the College of New Jersey (Princeton).

Three mountains are named for him—one in California (12,305 feet [3,751 m]), one in Tennessee and North Carolina (6,621 feet [2,018 m]), and one in New Hampshire (4,589 feet [1,399 m]). In addition, his name is the generic term for flat-topped underwater mountains rising from the ocean floor.