The EFW N-20 Aiguillon (in English: "Stinger") was Switzerland's first indigenous jet fighter aircraft. The Swiss Federal Aircraft Factory developed a design for a four-engined swept winged fighter following the end of the Second World War. During the test programme an unpowered glider was built and flown. A turbojet powered test aircraft, known as the Arbalète ("Crossbow"), also flew.
The N-20 design was not produced. Both the single Aiguillon and Arbalète airframes survive and are on public display at the Flieger-Flab-Museum, Dübendorf; the glider test aircraft was destroyed in an accident.