Sergei Viktorovich Gonchar (Russian: Серге́й Ви́кторович Гонча́р, IPA: ; born 13 April 1974) is a Russian former professional ice hockey player who is currently an assistant coach for the Pittsburgh Penguins. He has previously played for the Washington Capitals, Boston Bruins, Pittsburgh Penguins (with whom he won the Stanley Cup in 2009), Ottawa Senators, Dallas Stars and the Montreal Canadiens.
Gonchar began his professional career in 1991 with Traktor Chelyabinsk in the Soviet Championship League. He also played two seasons for Dynamo Moscow.
Gonchar was the first round pick, 14th overall, of the Washington Capitals in the 1992 NHL Entry Draft. He began his North American career in 1994, suiting up in two playoff games for the Capitals' American Hockey League (AHL) affiliate, the Portland Pirates. He continued with Portland in 1994–95 before making his NHL debut with the Capitals on 7 February 1995, against the Buffalo Sabres. He appeared in 31 games total during the lockout-shortened 1994–95 season. The following year, in his first full-length campaign in the NHL, Gonchar tallied 41 points, showing his potential as an effective offensive defenceman.