American light twin-engine passenger aircraft, manufactured by Cessna. This aeroplane is a further development of Cessna 411 construction. In 1968-1985 period 2000 pieces were produced. Due to several improvements, four versions of 421 model were eventually produced.

Cessna 421
Standard version, equipped with Continental GTSIO-520-D engines and 6 seats. MTOW is 3084 kg (6800 lbs).

Cessna 421A
Version with additional, seventh seat and increased MTOW to 3102 kg (6840 lbs).

Cessna 421B
Version equipped with Continental GTSIO-520-H engines. Possible seat configurations: 6,7,8 and 10 passenger seats. MTOW 3288 kg (7250 lbs), later on increased to  3379 kg (7450 lbs).

Cessna 421C
Version equipped with Continental GTSIO-520-L or -N engines and fuel tanks upgrade from 662 l capacity to 806 l capacity.