Oleg Igorevich Aleynik (; born 8 February 1989) is a Russian former professional footballer.
He made his Russian Football National League debut for FC Metallurg Lipetsk on 17 August 2009 in a game against FC Sibir Novosibirsk.
He made his Russian Premier League debut for FC Rotor Volgograd on 11 August 2020 in a game against FC Zenit Saint Petersburg.