Sergei Gennadyevich Nikolaev (; born 8 June 1972) is a Russian retired professional ice hockey goaltender.
Nikolaev played in the Russian Superleague for Kristall Saratov, Torpedo Yaroslavl, Khimik Voskresensk, Lada Togliatti, Severstal Cherepovets, SKA Saint Petersburg, Salavat Yulaev Ufa, Sibir Novosibirsk and Metallurg Novokuznetsk. He also spent three seasons with Ak Bars Kazan in the Superleague's successor Kontinental Hockey League but didn't play a game for the team.