The Midwest Division was a division in the Western Conference of the National Basketball Association (NBA). The division was created at the start of the 1970–71 season, when the league expanded from 14 to 17 teams with the addition of the Buffalo Braves, the Cleveland Cavaliers and the Portland Trail Blazers. The league realigned itself into two conferences, the Western Conference and the Eastern Conference, with two divisions each in each conference. The Midwest Division began with four inaugural members, the Chicago Bulls, the Detroit Pistons, the Milwaukee Bucks and the Phoenix Suns. The Bulls and the Suns joined from the Western Division, while the Pistons and the Bucks joined from the Eastern Division.