Martin Beaver (born 10 November 1967) is a Canadian violinist best known as first violinist of the Tokyo String Quartet.
Beaver joined the Tokyo String Quartet as its first violinist in 2002 and remained until they disbanded in 2013.
As a part of the Tokyo String Quartet, he played the Paganini-Comte Cozio di Salabue violin (circa 1727) on loan from the Nippon Foundation, part of the Paganini Quartet collection of instruments made by Antonio Stradivari.
He currently performs on a violin made by the luthier Nicola Bergonzi.
Now on faculty at the Colburn School in Los Angeles, he remains active in both chamber music and as a soloist, and established the Montrose Trio with pianist Jon Kimura Parker and cellist Clive Greensmith.