Dalhart Army Air Base is a former World War II military airfield complex near the city of Dalhart, Texas. It operated three training sites for the United States Army Air Forces from 1943 until 1945. The majority of the namesake city of Dalhart, Texas lies in southern Dallam County, while those parts of Dalhart city south of 11th Street are actually in northern Hartley County, Texas. The main airfield of Dalhart Army Air Base was 3.4 miles southwest of the city, so it was located in Hartley County. Auxiliary #1 (Hartley Field) was 10.2 miles west-southwest of the city, also in Hartley County. Auxiliary #2 (Dallam Field) was located 5.5 miles east-northeast of the city in Dallam County.