Konstantin Georgiyevich Mostras (Russian: Константин Георгиевич Мострас; 16 April 1886 – 6 September 1965) was a Soviet and Russian violinist and teacher.
He studied at the Moscow Philharmonic School of Music and Drama until 1914, and later was a teacher there (from 1914 till 1922).
From 1922 to 1932 he was one of the directors of Persimfans, the conductorless symphony orchestra.
As a teacher he played a significant role in the development of a Soviet violin school; among his pupils were Ivan Galamian,[1] Mikhail Terian, Andrey Abramenkov and Marina Yashvili.
He wrote and edited many instructional works and transcriptions for the violin, including an edition of Tchaikovsky's Violin Concerto (in collaboration with David Oistrakh) with a commentary on technique (Moscow, 1947) and studies for solo violin, as well as valuable writings on violin technique.