David Allan Farrish (born August 1, 1956 in Wingham, Ontario) is a former professional ice hockey defenceman who played 430 games in the National Hockey League (NHL). He played for the New York Rangers, Quebec Nordiques, and Toronto Maple Leafs. While playing in the American Hockey League, Farrish won the Eddie Shore Award as the league's best defenceman during the 1981–82 AHL season.
Farrish has served as head coach for the Moncton Hawks, Salt Lake Golden Eagles, Fort Wayne Komets, Springfield Falcons, Louisiana IceGators and the Pensacola Ice Pilots. At the NHL level, Farrish served as an assistant coach to Randy Carlyle with the Anaheim Ducks from 2005 to the middle of the 2011-12 season. On March 3, 2012, Farrish was appointed an assistant coach, again under Carlyle, with the Toronto Maple Leafs. Farrish was let go by the Maple Leafs in May 2014.
Farrish was named as an assistant coach for the Colorado Avalanche on July 7, 2015. On May 23, 2017, Farrish was relieved of these duties.