Keystone Ranch Airport (ICAO: 5TE6) is a private general aviation airstrip located near San Angelo, Texas, in the United States. It serves the operational needs of the Keystone Ranch property and is not open to the general public without prior permission. The facility is a small, privately owned airstrip typical of rural Texas ranch operations, providing convenient air access for ranch management and private use. It is not a commercial airport and does not handle scheduled passenger service.