The 1981 NBA World Championship Series was the championship round of the National Basketball Association (NBA)'s 1980–81 season, and the culmination of the season's playoffs. It pitted the 62–20 Eastern Conference champion Boston Celtics against the 40–42 Western Conference champion Houston Rockets. The Celtics defeated the Rockets in six games for their fourteenth NBA championship. Won the 1981 NBA Finals on May 14, 1981. Wiki link