The cuatro is a family of Latin American string instruments played in Colombia, Puerto Rico, Venezuela and other Latin American countries. It is derived from the Spanish guitar. Although some have viola-like shapes, most cuatros resemble a small to mid-sized classical guitar. In Puerto Rico and Venezuela, the cuatro is an ensemble instrument for secular and religious music, and is played at parties and traditional gatherings.

The cavaquinho is a small Portuguese string instrument in the European guitar family, with four wires or gut strings.