A Tonbak is a goblet drum from Persia which is considered the principal percussion instrument of Persian music.

The skin is usually glued to the body. Goat or lamb skin is the most popular material for the skin. The body of a Tonbak is made of mulberry wood which gives it its distinctive sound. The body may be decorated with carved furrows. The throat is almost cylindrical and it is connected from top to the body. The throat and the small opening together are in the form of a trumpet. The large opening is in the top and is covered by the skin. A Tonbak player holds the drum diagonally across his lap with the wider section usually over his right side and plays it with the fingers and the palm of the hands.