The Curtiss JN-4 "Jenny" is a series of biplane aircraft built by the Curtiss Aeroplane Company of Hammondsport, New York, later the Curtiss Aeroplane and Motor Company. The Curtiss JN series (the common nickname was derived from "JN") was produced as a training aircraft for the U.S. Army although the "Jenny" became the "backbone of American post-war aviation."

The Curtiss JN-4 is possibly North America's most famous World War I aircraft. It was widely used during World War I to train beginning pilots. The Canadian version was the JN-4 (Can), also known as the "Canuck", and was built with a control stick instead of the Deperdussin control wheel used in the regular JN-4 model, as well as usually having a somewhat more rounded rudder outline than the American version. The U.S. version was called "Jenny". It was a twin-seat (student in front of instructor) dual control biplane. Its tractor prop and maneuverability made it ideal for initial pilot training with a 90 horsepower (67 kW) Curtiss OX-5 V8 engine giving a top speed of 75 miles per hour (121 km/h) and a service ceiling of 6,500 feet (2,000 m).