The Groen Hawk 4 was a single engine, pusher configuration, four seat autogyro built in the United States in the late 1990s.

Changes between the Hawk III and 4, apart from cabin revisions to accommodate the extra seat, included a new constant chord, aluminium rotor in place of the earlier tapered, composite blade.

[2] A second aircraft, initially designated Hawk 4T and powered by a 313 kW (420 hp) Rolls-Royce 250-B17C turboprop driving a three blade propeller first flew on 12 July 2000.

[3] It had a taller undercarriage, high set tailplane, endplate fins with rounded extensions below the tailbooms and modifications to the inboard rudders.

[3] In 2002, the Winter Olympic Games contracted with GBA to provide aerial security over Salt Lake International Airport.