The 1972–73 Seattle SuperSonics season was the 6th season of the Seattle SuperSonics in the National Basketball Association (NBA). The team finished the regular season in 6th place in the Western Conference with a 26–56 record, 21 wins behind the one obtained in their previous season. Head coach Tom Nissalke was fired by the team in January after a 13–32 start and was replaced by his assistant Bucky Buckwalter.