The 1989–90 Phoenix Suns season was the 21st season for the Phoenix Suns of the National Basketball Association. Cotton Fitzsimmons was head coach for a club that returned to the Western Conference Finals. All home games were played at Arizona Veterans Memorial Coliseum. The Suns finished third in the Pacific Division with a 54–28 record. In the first round of the playoffs, the Suns defeated the 4th-seeded Utah Jazz in five games. In the semifinals, they upset the top-seeded Los Angeles Lakers in five games, but lost to the Portland Trail Blazers four games to two in the Western Conference Finals.

The season was highlighted by Tom Chambers setting a franchise record for points scored in one game, when on February 18, he scored 56 points on the road against Golden State Warriors. Just over a month later, he would break his own record when he scored 60 against Seattle SuperSonics on March 24.

Kevin Johnson was selected to the 1990 NBA All-Star Game along with Chambers. It was his first All-Star selection.

The Suns traded first-round pick Anthony Cook on draft night to the Detroit Pistons for 27th pick Kenny Battle and Micheal Williams. Battle played for a season and a half before being waived in January 1991. Micheal Williams would play six games for the Suns before being waived. The Suns received the 46th pick (Ricky Blanton) from the Chicago Bulls when they traded Craig Hodges for Ed Nealy. Blanton, after knee surgery, sat on the bench for the 89–90 season, and was waived shortly after the start of the 90–91 season. Mike Morrison played sparingly in the 89–90 season, and was traded before the start of the 90–91 season. Greg Grant played the season as a backup to Kevin Johnson, before being released in the 1990 offseason.

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