A tom-tom drum (not to be confused with a tam-tam) is a cylindrical drum with no snare.

Although "tom-tom" is the British term for a child's toy drum, the name came originally from the Anglo-Indian and Sinhala; the tom-tom itself comes from Asian or Native American cultures. The tom-tom drum is also a traditional means of communication. The tom-tom drum was added to the drum kit in the early part of the 20th century.

Traditionally, drum kit sizes are expressed as depth x diameter, both in inches. More recently, many major manufacturers have begun instead to express the size as diameter x depth, again always in inches.

For a drum kit tom-tom, the more significant measurement is the diameter, so this article uses diameter x depth. Hence a 10" tom-tom of 8" depth is described as 10 x 8.

For a more detailed description of the conventions and their usage, see drum size conventions.