Four-string guitar
There are many instruments which can be or are commonly referred to as four string guitars.
Guitar family instruments with four strings
- Bass guitar
 - Braguinha
 - Cak used in Kroncong music
 - Cavaquinho
 - Celovic used in Tamburica orchestras
 - Cuatro Venezolano
 - Tenor guitar
 - Ukulele
 - Cigar box guitars often have three or four strings.
 - Duitara used in Khasi music
 
Guitar family instruments with four courses of strings
- The Renaissance guitar.
 - Brac and Bugaria used in Tamburica orchestras
 - Some Chitarra Battentes
 - Some Kabosys
 - Tahitian ukulele
 - Tiple