Mount Appleton, Mountain summit in Olympic National Park, Clallam County, United States

Mount Appleton is a 6,017-foot (1,834 m) double-summit mountain in the Olympic Mountains of Clallam County, Washington, set within Olympic National Park northwest of Appleton Pass. Its summit rises 3,000 feet (914 m) above the Sol Duc River in 1.5 miles (2.4 km). Runoff drains into the Sol Duc River and Boulder Creek, a tributary of the Elwha River.

Mount Appleton was named for Dr. Thomas Joseph Appleton (1863–1942), a physician who moved from Michigan to Port Angeles around 1897. He made house calls in remote parts of Clallam County and was the first white doctor to treat Native Americans there. He later served three terms as mayor of Port Angeles.

The name honors Dr. Thomas Joseph Appleton, a physician who arrived in Port Angeles around 1897 and was the first white doctor to treat Native Americans in the area. He made house calls across rural Clallam County, published writings, and served three terms as mayor before his death in 1942.

Climbing this summit requires scrambling experience and proper gear, especially during snowy winter conditions. Starting from marked trails and checking local conditions before departing is essential for a safe visit.

Mount Appleton has two summits; the higher South Appleton reaches over 6,100 feet and lies just 0.33 mile to the south. The name honors Dr. Thomas Joseph Appleton, a Port Angeles physician and three-term mayor who died in 1942.