The Douglas O-43 was a monoplane observation aircraft used by the United States Army Air Corps.

They differed from the final configuration of the O-31A, with a wire-braced parasol wing, and a new fin and rudder.

An order for 23 O-43A aircraft was completed during 1934, with a deepened fuselage, which eliminated the need for the ventral bulge under the observer's position.

Powered by a single 675 hp Curtiss V-1570-59 inline engine, it also had taller vertical surfaces with an inset rudder similar to the O-31A.

Related development Aircraft of comparable role, configuration, and era