Nagle Warren Mansion, also known as Cheyenne YWCA Building, is former residence and YWCA with three buildings located in Cheyenne, Laramie County, Wyoming. The mansion is on the edge of Cheyenne's historic downtown section on Cattle Baron’s Row. It is now a bed and breakfast (B&B) establishment with 12 guest rooms decorated in Victorian West style. One guest room is a suite and each room has its own bath. Six rooms are in the main house and six in the carriage house. There are three conference rooms. The B&B has a AAA 4 diamond rating. Furnishings are authentic to the period of the American Old West and include: furniture, wallpaper, brass marble, bronze or gas fireplaces, ornate staircases, woodwork of cherry, mahogany, and oak, and stained glass windows. There is some Moorish tile and a Moroccan chandelier.
The house was added to the National Register of Historic Places on July 12, 1976.