The 1966 NBA World Championship Series was the championship round of the 1966 NBA Playoffs, which concluded the National Basketball Association (NBA)'s 1965–66 season. The Eastern Division champion Boston Celtics faced the Western Division champion Los Angeles Lakers in a best-of-seven series that the Celtics won 4 games to 3. For the Celtics this was their tenth straight finals appearance, which tied a North American professional sports record set by the National Hockey League's Montreal Canadiens from 1951 to 1960, and the National Football League's Cleveland Browns from 1946 to 1955.

Frederick Appleton Schaus was an American basketball player, head coach and athletic director for the West Virginia University Mountaineers, player for the National Basketball Association's Fort Wayne Pistons and New York Knicks, general manager and head coach for the Los Angeles Lakers, head coach of Purdue University basketball, and a member of the NCAA Basketball Committee. He was born in Newark, Ohio.