An overtone flute has either no tone holes, or relatively few tone holes for a woodwind instrument. To make melodies, one plays it high into the overtone series. One series of harmonics is achieved by overblowing with the end of the tube open and another is achieved with the end closed. This means that most overtone flutes produce only the notes present in the natural scale.
Overtone flute tubes typically have a relatively long resonating chamber compared to their inner diameter or cross sectional area, which encourages the instrument to resonate in the higher harmonics. An overtone flute in the key of G, with an inner diameter of 1", will require more effort to play higher harmonics than an overtone flute in the same key, with an inner diameter of 1/2". For example, a ratio of 1 : 30 - Inner Diameter : Length allows for very high harmonics to be played with little effort.
- Kalyuka - Russian and Ukrainian overtone flute. Traditionally, the Kalyuka was constructed from the Borshevik branch. Because of the fragile nature of the branch, the instrument was played seasonally.
- Tylynka/ Tilinkó /Tilinca - Ukrainian/Hutsul, Hungarian, and Romanian overtone flute.
- Willow flute - Scandinavian flute
- Fujara - a Slovak flute. Also known as the "Shepherd's Flute", the Fujara was developed over many years by shepherds in Slovakia and Poland. The Fujara incorporates what we now know as the major scale. There are three playing holes, the full scale is played by overblowing from the 4th of the scale (all holes open - 1st harmonic), to the 5th (all holes closed - 2nd harmonic).
- Koncovka - Slovak Overtone flute with a fipple. The Koncovka is very similar to the Kalyuka. The Koncovka is constructed with a fipple.
- Choctaw overtone flute
- Natural trumpet, brass overtone instrument
- "FAQ about: Koncovka (overtone flute)". Folkart Slovakia.
- Maclagan, Susan J. (2009). A Dictionary for the Modern Flutist, p.124. ISBN 9780810867284.
- Perret, Daniel (2005). Roots of Musicality: Music Therapy and Personal Development, p.161. ISBN 9781846420900.
- Clint Goss (2012). "The Choctaw Overtone Flute / Indigenous North American Flutes". Flutopedia. Retrieved 2012-02-22.
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