The 1989–90 NBA season was the Detroit Pistons' 42nd season in the National Basketball Association, and 33rd season in the city of Detroit.^[1] The team played at the Palace of Auburn Hills in suburban Auburn Hills, Michigan. As the defending champions, the Pistons had another successful season winning 13 consecutive games around January and February,^[2] holding a 35–14 record at the All-Star break,^[3] then posting a 12-game winning streak in March,^[4][5] as they finished first place in the Eastern Conference with a 59–23 record.^[6]

Isiah Thomas led the team with 18.4 points, 9.4 assists and 1.7 steals per game, while last year's Finals MVP Joe Dumars averaged 17.8 points and 4.9 assists per game, and was named to the All-NBA Third Team, and Dennis Rodman provided the team with 8.8 points and 9.7 rebounds per game, and was named Defensive Player of the Year.^{[7][8][9][10]} In addition, James Edwards provided with 14.5 points per game, while Mark Aguirre contributed 14.1 points per game, and Bill Laimbeer averaged 12.1 points and 9.6 rebounds per game. Off the bench, Vinnie Johnson contributed 9.8 points per game, and John Salley led the team with 1.9 blocks per game.^[11] Thomas, Dumars and Rodman were all selected for the 1990 NBA All-Star Game, with head coach Chuck Daly coaching the Eastern Conference.^{[12][13][14][15]} Dumars and Rodman were both named to the NBA All-Defensive First Team.

In the Eastern Conference First Round of the playoffs, the Pistons swept the Indiana Pacers in three straight games,^{[16][17][18][19]} then defeated the 5th-seeded New York Knicks four games to one in the Eastern Conference Semi-finals.^{[20][21][22][23]} In the Eastern Conference Finals, the Pistons defeated the Chicago Bulls in seven games to advance to the NBA Finals for the third straight year.^{[24][25][26][27]}

In the Finals, the Pistons faced the Portland Trail Blazers, who were led by Clyde Drexler. The Pistons won Game 1 at home, 105–99,^[28][29][30] but lost Game 2 in overtime, 106–105 as the Blazers tied the series at one game a piece,^[31][32][33] the Pistons defeated the Blazers in five hard-fought games to win their second consecutive NBA championship. Thomas was named NBA Finals MVP.^{[34][35][36][37][38]} The Pistons would not reach the NBA Finals again until 2004, in which they won the Finals in five games against their heavily favored rivals, the Los Angeles Lakers to win their third NBA championship.^[39]

• Isiah Thomas, NBA Finals Most Valuable Player Award
• Dennis Rodman, NBA Defensive Player of the Year Award
• Joe Dumars, All-NBA Third Team
• Joe Dumars, NBA All-Defensive First Team
• Dennis Rodman, NBA All-Defensive First Team