The Tokyo String Quartet (東京クヮルテット) was an international string quartet that operated from 1969 to 2013.

The group formed in 1969 at the Juilliard School of Music. The founding members attended the Toho Gakuen School of Music in Tokyo, where they studied with Professor Hideo Saito. Soon after its formation the Quartet won First Prizes at the Coleman Competition, the Munich Competition and the Young Concert Artists International Auditions. This resulted in a recording contract with Deutsche Grammophon.