Mount Worthington is a elevation double-summit mountain located in the eastern Olympic Mountains in Jefferson County of Washington state. It is set within Buckhorn Wilderness, on land managed by the Olympic National Forest. Its nearest higher peak is Buckhorn Mountain, to the southwest. Precipitation runoff from Mount Worthington drains south into the Big Quilcene River, or north into Copper Creek which is a tributary of the Dungeness River. This mountain was first known as Copper Peak, but was renamed by Jack Christensen for the William J. Worthington family, pioneers of nearby Quilcene. Copper was mined in the Tubal Cain mine at the northern base of this mountain in the early 1900s. In the same vicinity of the abandoned mine are the remains of a modified B-17 plane that crashed on January 19, 1952, when returning from a search-and-rescue mission.