The Spear-O-Wigwam Ranch is a former dude ranch, now a campus of Sheridan College, Wyoming, the Spear-O-Wigwam Mountain Campus. It was listed on the National Register of Historic Places in 2016. It is located at the southeast end of Park Reservoir, about two miles north of Cloud Peak Wilderness Area at altitude of .
It closed as a dude ranch in 2011.
One of its log guest cabins is known as the "Hemingway Cabin", where Ernest Hemingway stayed in 1928 with his wife Pauline while writing A Farewell to Arms. The cabin is approximately .