Sergei Lvovich Nemchinov (Russian: ?????ยด? ??????? ????????, born 14 January 1964) is a Russian former professional ice hockey player who played in the National Hockey League (NHL) for the New York Rangers, Vancouver Canucks, New York Islanders and the New Jersey Devils for twelve seasons, bookended by ten seasons in the Soviet Championship League with PHC Krylya Sovetov and HC CSKA Moscow, and two in the Russian Superleague with Lokomotiv Yaroslavl.
Nemchinov works as a consultant coach in the Turkmenistan men's national ice hockey team.