The McDonald Observatory is an astronomical observatory located near the unincorporated community of Fort Davis in Jeff Davis County, Texas, United States. The facility is located on Mount Locke in the Davis Mountains of West Texas, with additional facilities on Mount Fowlkes, approximately to the northeast. The site is property of the University of Texas at Austin, and is primarily funded through two special items in the Texas state budget: the McDonald Observatory line item and the CASA (Center for Advanced Studies in Astronomy) line item.