Mount Hornaday, Mountain summit in Yellowstone National Park, United States.

Mount Hornaday is a 10,003-foot (3,049 m) peak in the Absaroka Range, in the northeast section of Yellowstone National Park, Wyoming. It rises above the Lamar Valley a few kilometres south of the Montana state line. The sources describe no vegetation zones on its slopes.

The peak was named in 1938 after William Temple Hornaday, a conservationist who spent his career protecting American bison from extinction. This naming honored his conservation legacy during a period of active effort to save the threatened species.

The name, given in 1938, honours William Temple Hornaday, former director of the New York Zoological Gardens, who campaigned to save the American bison from extinction. Visitors crossing the Lamar Valley see the peak rising above the valley floor, a few kilometres south of the Montana state line.

The best season for visiting is summer through early autumn, from June to September, when trails are snow-free and generally passable. Visitors should prepare for variable mountain weather and bring adequate water and gear for a strenuous uphill hike.

The two source articles give different summit elevations: the English Wikipedia lists 10,003 feet (3,049 m), while the German article states 3,058 m. The peak rises above the Lamar Valley, a few kilometres south of the Montana state line, so the state border is visible on the ridge to the north.