Traditional Thai musical instruments are the musical instruments used in the traditional and classical music of Thailand. They comprise a wide range of wind, string, and percussion instruments played by both the Thai majority as well as the nation's ethnic minorities.

The saw sam sai is a traditional bowed string instrument of Thailand. It is in the saw family of Thai fiddles, which also includes the saw u and saw duang, but unlike the other two, it has three strings and a bow that is separate from the instrument.