The Avia BH-33 was a biplane fighter aircraft manufactured in Czechoslovakia in 1927. It was derived from the BH-21J, which exhibited promising performance by integrating the original BH-21 air-frame with a licensed Bristol Jupiter radial engine. Aside from the distinctive Avia characteristic of having an upper wing with a shorter span than the lower wing, it was entirely conventional, even incorporating a tail fin for the first time in a design by Pavel Beneš and Miroslav Hajn (earlier aircraft featured a rudder but lacked a fin).
