Karl Johannes Max Strub (28 September 1900 – 23 March 1966) was a German violin virtuoso and eminent violin pedagogue. He gained a Europe-wide reputation during his 36 years of activity as primarius of the Strub Quartet. Stations as concertmaster led him from the 1920s to the operas of Stuttgart, Dresden and Berlin. Appointed Germany's youngest music professor at the Hochschule für Musik Franz Liszt, Weimar in 1926, he followed calls to the Berlin University of the Arts and, after the Second World War to the Hochschule für Musik Detmold. Strub was a connoisseur of the classical-romantic repertoire, but also devoted himself to modern music, among others he gave the world premiere of Hindemith's Violin Sonata No. 2 in D major. He promoted the music of Hans Pfitzner. Strub played on a Stradivari violin until 1945; numerous recordings from the 1930s/40s document his work.