Mount Woolsey, Mountain summit in Bighorn Mountains, Wyoming, US.

Mount Woolsey is a 12,982-foot (3,957 m) summit in the Bighorn Mountains of Wyoming, the third highest in the range after Cloud Peak and Black Tooth Mountain. It sits on a knife-like arête in the Cloud Peak Wilderness of Bighorn National Forest, connected by that ridge to both neighbours, with The Innominate along the crest and a small glacier below the arête to the southeast.

The first recorded ascent was made by W. B. Willcox, Alan Willcox, Mary Willcox and T. H. Rawles, who climbed the south ridge. Theodore Salisbury Woolsey Jr., father of Elizabeth Woolsey, a member of that climbing party, died a few days before the ascent; she left the group upon hearing of his death. The name Mount Woolsey was formally approved in 1961 in his memory.

The name Mount Woolsey was formally approved in 1961, commemorating Theodore Salisbury Woolsey Jr., father of Elizabeth Woolsey. She had been climbing with the Willcox party until she learned of her father's unexpected death, which occurred a few days before the party's first ascent.

Reaching the area requires driving a high-clearance vehicle from Sheridan along Route 26 to Route 293, which passes through rough terrain toward Bighorn Reservoir. From there, most climbers continue on foot to approach the summit.

A small glacier sits on the southeast face of the mountain, adding an unexpected feature to this high elevation peak. It ranks as the third highest summit in the entire Bighorn Mountain chain.