Born in Leningrad. In 2014 he graduated from St. Petersburg Conservatory where his teacher was Associate Prof. Anna Laukhina. He currently studies conducting under Prof. Alexander Polishchuk.
Laureate of the international competitions in Austria and Finland, he participated in the Junger Künstler Bayeruth festival as a member of chamber and full orchestra; he also took part in the master classes by the Swiss violinist Thomas Füry in 2008 and British conductor Peter Stark in 2015.
Since 2009 Ilia Diakov has been member of the Mariinsky orchestra first violin section and since 2014 he participates in the concerts on Mariinsky chamber stages.