The byzaanchy (Tuvan: бызаанчы; Russian: Бизанчи; also transliterated byzanchi or byzanchie) is a four-stringed vertical spike fiddle used in the traditional music of Tuva.

The byzaanchy's soundbox may be cylindrical, cubical, hexagonical or octagonical.

The bow is made of horsehair and has two strands which are weaved in between the strings.

The headstock of the instrument is often decorated with a horse or bull head.

This article relating to instruments of the huqin family is a stub.