String Quartet No. 8 may refer to:
String Quartet No. 8 (Beethoven) by Ludwig van Beethoven String Quartet No. 8 (Diamond) by David Diamond String Quartet No. 8 (Dvořák) by Antonín Dvořák String Quartet No. 8 (Hill) by Alfred Hill String Quartet No. 8 (Maconchy) by Elizabeth Maconchy String Quartet No. 8 (Milhaud), Op. 121, by Darius Milhaud Quartet No. 8 in F major, K. 168, part of the Viennese Quartets by Wolfgang Amadeus Mozart String Quartet No. 8 (Porter) by Quincy Porter String Quartet No. 8 (Rihm) by Wolfgang Rihm String Quartet No. 8 (Schubert) by Franz Schubert String Quartet No. 8 (Shostakovich) by Dmitri Shostakovich String Quartet No. 8 (Simpson) by Robert Simpson String Quartet No. 8 (Spohr) by Louis Spohr String Quartet No. 8 (Villa-Lobos) by Heitor Villa-Lobos