Ilia Simakin (born 27 October 2003) is a Russian tennis player.
Simakin has a career high ATP singles ranking of 465 achieved on 22 July 2024. He also has a career high ATP doubles ranking of 268 achieved on 5 August 2024.
Simakin has won 1 ATP Challenger doubles title at the 2024 President's Cup with Egor Agafonov.