Maksim Konstantinovich Kaynov (; born 24 March 2002) is a Russian football player who plays as a defensive midfielder for Rotor Volgograd on loan from Sochi.
He made his debut in the Russian Premier League for Arsenal Tula on 2 April 2022 in a game against Akhmat Grozny.
On 20 August 2025, Kaynov was loaned by Rotor Volgograd, with an option to buy.
He is a son of former footballer Konstantin Kaynov.