Leonid Georgiyevich Ilyichev (, also Ilyichov; born 30 January 1948) is a retired Russian freestyle swimmer. He competed in five events at the 1968 Summer Olympics and won three team medals; individually, he finished fifth in the 100 m freestyle. He also won six European medals in 1966 and 1970, five in team events, and one individual, a silver in the 100 m freestyle.