The Aero A.101 was a biplane light bomber and reconnaissance aircraft built in Czechoslovakia during the 1930s. It was an attempt to improve the Aero A.100 by enlarging it and fitting it with a more powerful engine. However, even with 33% more power, performance was actually inferior, and the Czechoslovak Air Force was not interested in the type. Production did result, however, when 50 were ordered by Spanish Republican forces for use in the Spanish Civil War. Some of these aircraft were captured by Nationalists while en route and used against their original buyers.