The flageolet is a woodwind instrument and a member of the family of duct flutes that includes recorders and tin whistles. Its invention was erroneously ascribed to the 16th-century Sieur Juvigny in 1581. There are two basic forms of the instrument: the French, having four finger holes on the front and two thumb holes on the back; and the English, having six finger holes on the front and sometimes a single thumb hole on the back. The latter was developed by English instrument maker William Bainbridge, resulting in the "improved English flageolet" in 1803. There are also double and triple flageolets, having two or three bodies that allowed for a drone and countermelody. Flageolets were made until the 19th century.

The term fipple specifies a variety of end-blown flute that includes the flageolet, recorder, and tin whistle. The Hornbostel–Sachs system for classifying musical instruments places this group under the heading "Flutes with duct or duct flutes." The label "fipple flute" is frequently applied to members of the subgroup but there is no general agreement about the structural detail of the sound-producing mechanism that constitutes the fipple, itself.