1979–80 Seattle SuperSonics season

The 1979–80 NBA season was the SuperSonics' 13th season in the NBA. The SuperSonics entered the season as the defending NBA champions, having defeated the Washington Bullets in five games in the 1979 NBA Finals, winning their first and only NBA championship.

In the playoffs, the SuperSonics defeated the Portland Trail Blazers in three games in the First Round, then defeated the Milwaukee Bucks in seven games in the Semi-finals, before losing to the eventual NBA champion Los Angeles Lakers in five games in the conference finals.

Playoffs

 * - align="center" bgcolor="#ccffcc"
 * 1
 * April 2
 * Portland
 * W 120–110
 * Gus Williams (35)
 * three players tied (8)
 * Gus Williams (6)
 * Kingdome 26,412
 * 1–0
 * - align="center" bgcolor="#ffcccc"
 * 2
 * April 4
 * @ Portland
 * L 95–105 (OT)
 * Dennis Johnson (24)
 * Lonnie Shelton (12)
 * Gus Williams (8)
 * Memorial Coliseum 12,666
 * 1–1
 * - align="center" bgcolor="#ccffcc"
 * 3
 * April 6
 * Portland
 * W 103–86
 * Gus Williams (21)
 * John Johnson (8)
 * Williams, D. Johnson (6)
 * Kingdome 23,546
 * 2–1


 * - align="center" bgcolor="#ccffcc"
 * 1
 * April 8
 * Milwaukee
 * W 114–113 (OT)
 * Gus Williams (30)
 * Jack Sikma (11)
 * John Johnson (6)
 * Seattle Center Coliseum 13,648
 * 1–0
 * - align="center" bgcolor="#ffcccc"
 * 2
 * April 9
 * Milwaukee
 * L 112–114 (OT)
 * Lonnie Shelton (25)
 * Lonnie Shelton (9)
 * Williams, J. Johnson (7)
 * Seattle Center Coliseum 14,050
 * 1–1
 * - align="center" bgcolor="#ffcccc"
 * 3
 * April 11
 * @ Milwaukee
 * L 91–95
 * Jack Sikma (20)
 * Jack Sikma (13)
 * Williams, J. Johnson (7)
 * MECCA Arena 10,938
 * 1–2
 * - align="center" bgcolor="#ccffcc"
 * 4
 * April 13
 * @ Milwaukee
 * W 112–107
 * Gus Williams (32)
 * Lonnie Shelton (15)
 * John Johnson (7)
 * MECCA Arena 10,938
 * 2–2
 * - align="center" bgcolor="#ffcccc"
 * 5
 * April 15
 * Milwaukee
 * L 97–108
 * Gus Williams (22)
 * Jack Sikma (9)
 * Dennis Johnson (7)
 * Kingdome 40,172
 * 2–3
 * - align="center" bgcolor="#ccffcc"
 * 6
 * April 18
 * @ Milwaukee
 * W 86–85
 * Dennis Johnson (18)
 * Paul Silas (14)
 * John Johnson (7)
 * MECCA Arena 10,938
 * 3–3
 * - align="center" bgcolor="#ccffcc"
 * 7
 * April 20
 * Milwaukee
 * W 98–94
 * Gus Williams (33)
 * Lonnie Shelton (15)
 * Dennis Johnson (5)
 * Seattle Center Coliseum 14,050
 * 4–3


 * - align="center" bgcolor="#ccffcc"
 * 1
 * April 22
 * @ Los Angeles
 * W 108–107
 * Gus Williams (28)
 * Lonnie Shelton (9)
 * John Johnson (9)
 * The Forum 17,505
 * 1–0
 * - align="center" bgcolor="#ffcccc"
 * 2
 * April 23
 * @ Los Angeles
 * L 99–108
 * Gus Williams (24)
 * Jack Sikma (11)
 * Jack Sikma (8)
 * The Forum 17,505
 * 1–1
 * - align="center" bgcolor="#ffcccc"
 * 3
 * April 25
 * Los Angeles
 * L 100–104
 * Gus Williams (23)
 * John Johnson (9)
 * Gus Williams (11)
 * Hec Edmundson Pavilion 8,524
 * 1–2
 * - align="center" bgcolor="#ffcccc"
 * 4
 * April 27
 * Los Angeles
 * L 93–98
 * Gus Williams (25)
 * Dennis Johnson (9)
 * Gus Williams (7)
 * Hec Edmundson Pavilion 8,524
 * 1–3
 * - align="center" bgcolor="#ffcccc"
 * 5
 * April 30
 * @ Los Angeles
 * L 105–111
 * Dennis Johnson (29)
 * Jack Sikma (9)
 * Williams, J. Johnson (6)
 * The Forum 17,505
 * 1–4

Awards and records

 * Dennis Johnson, All-NBA Second Team
 * Gus Williams, All-NBA Second Team
 * Dennis Johnson, NBA All-Defensive First Team

Transactions
October 19, 1979
 * Waived Joe Hassett.
 * Waived Jackie Robinson.

October 11, 1979
 * Waived Dennis Awtrey.