The Antonov A-1 and related designs were a family of single-seat training gliders produced in the Soviet Union in the 1930s and 40s. All were derived from the Standard-2 (Стандарт-2) (designed and flown by Oleg Konstantinovich Antonov in 1930) which in turn were derived from the Standard-1. They were produced in large numbers with around 5 400 built of the U-s3 U-s4 and P-s2 major versions alone. The same design formed the basis for the Antonov A-2 and its related group of two-seat designs.