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Ryan Airfield (ICAO: KRYN, FAA LID: RYN), also known as Ryan Field, is a city-owned, public-use airport located 12 miles (10 nmi; 19 km) southwest of the central business district of Tucson, a city in Pima County, Arizona, United States. It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a reliever airport. It is mostly used for general aviation but also serves a significant amount of law enforcement and military helicopter activity. Approximately 50% of Ryan's traffic is training-related.