20 — Washington Capitols:
Red Auerbach is revered as a Celtics legend, but coached the Washington Capitols first. This streak spanned two seasons (1947-48 and 1948-49) and happened in the Basketball Association of America (BAA), which begot the NBA in 1949-50. The Capitols were 24-20 and riding a six-game losing
streak when they won the last five games of the 1947-48 season and the first 15 the following season, when they lost to the Minneapolis Lakers in the Finals.
20 — Milwaukee Bucks: Led by 11-year veteran point guard Oscar Robertson and second-year center Lew Alcindor (a name he changed to Kareem Abdul-Jabbar the day after the season), the Bucks finished 66-16 in 1970-71 and won their lone NBA championship. This team held the NBA's longest winning streak before the Lakers came along two seasons later and won 33 straight, a streak Milwaukee incidentally snapped. The Bucks also had streaks of 16 and 10 games that season.