Hradčany Airport is a former military airport within the area of Ralsko in Liberec Region, northern Czech Republic. Built toward the end of World War II for the Luftwaffe, it was expanded after the war. In 1968 the Soviet Army took control and set up a large air base here. However, after the Soviets left in 1991, the airport was abandoned and it is now neglected and damaged.

Ralsko is a town in Česká Lípa District in the Liberec Region of the Czech Republic. It has about 2,300 inhabitants. It comprises area of the former military training area with Hradčany Air Base. Ralsko is the fourth largest municipality in the country by area.