String Quartet in C major may refer to: No. 2 of the String Quartets, Op. 20 (Haydn) No. 3 of the String Quartets, Op. 33 (Haydn) No. 2 of the String Quartets, Op. 50 (Haydn) No. 1 of the String Quartets, Op. 64 (Haydn) No. 3 "Kaiserquartett" of the String Quartets, Op. 76 (Haydn) String Quartet No. 4 (Mozart) String Quartet No. 10 (Mozart) String Quartet No. 19 (Mozart) String Quartet No. 9 (Beethoven) String Quartet No. 11 (Dvořák) String Quartet No. 4 (Bartók) String Quartet No. 1 (Szymanowski) String Quartet No. 1 (Shostakovich) String Quartet No. 2 (Britten)