Adelaide United FC's 2006–07 season season was the Reds' A-League 2006–07 season. The club had a successful first season of the A-League, winning the Premiership and finishing third in the finals series. Adelaide began their 2006-07 season with a 2-2 draw with local club Adelaide Galaxy and a 2-1 win over a State Select in their pre-season fixtures. This was followed up with a highly successful pre-season cup which the Reds won, defeating on penalties in the grand final.
Adelaide United are currently linked with Brazilian football legend Romário. The 1994 World Cup winner is still attempting to score 1,000 goals and be up there with Pelé as the all-time greatest scorer. Romário, 40, will play for the Reds on a four week guest stint of which each club is allowed to sign two players. Last year, Sydney FC signed Kazuyoshi "Kazu" Miura for four A-League matches and the Club World Championships and this season they are set to sign Italian forward Benito Carbone. The Newcastle United Jets are also reportedly interested in a guest player, former 1990s English striker Stan Collymore.