Viktor Viktorovich Tretiakov (Russian: Ви́ктор Ви́кторович Третьяко́в; born 17 October 1946) is a Russian violinist and conductor. Other spellings of his name are Victor, Tretyakov and Tretjakov.
The son of a musician who played in the military band in Siberian city of Krasnoyarsk, he showed an extraordinary musical talent very early, and started to play violin at the age of seven. He came to Moscow in 1954 and first studied in the junior division of the Moscow Conservatory Music College, and in 1956 entered Yuri Yankelevich's class at the Moscow Central Music School, later studying with him in the Moscow Conservatoire.
In 1966, at the age of 19 he won the first prize in the Third International Tchaikovsky Competition and was invited to appear on several international concert tours – something that had become much easier after the pioneering visits outside the Soviet Union by artists such as Richter, Gilels, Rostropovich, and Oistrakh. The influence of the last could be noticed in Tretyakov's interpretations and also in his choice of the repertoire; Tretyakov favoured the great romantic violin concertos such as those by Brahms, Mendelssohn, Tchaikovsky, Sibelius and music of Prokofiev and Shostakovich. His unique style is supported by impeccable technique and deep musical insight, created by an expressive use of phrasing.