The GY-80 Horizon is a French four-seat touring monoplane of the 1960s designed by Yves Gardan [fr] and built under licence, first by Sud Aviation, and later by that company's SOCATA subsidiary.

The prototype first flew on 21 July 1960 and the aircraft was initially produced by Sud Aviation at Nantes and Rochefort.

[6] The all-metal design has a low-mounted cantilever wing with four mechanically operated Fowler-type trailing-edge flaps and two Frise-type ailerons.

[citation needed] The first prototype used a 150 hp (112 kW) Avco Lycoming O-320 flat air-cooled engine driving a fixed-pitch metal propeller, with production aircraft using this engine or a 160 hp (120 kW) version of the O-320, and had an option to use a constant speed propeller.

[11] Most Horizons were bought by French pilot owners, but examples were exported to several countries including Germany, Switzerland and the United Kingdom and numbers remain in service in 2014.