The 2007–08 Adelaide United FC season was the clubs third season since the inception of the A-League. The club competed in the 2007–08 A-League and finished sixth on the ladder.

For the 2007–08 season Adelaide recruited ex-Socceroo Paul Agostino "marquee", Ivorian Jonas Salley and ex-Olyroo Kristian Sarkies. They also signed Issy Erdogan of Preston Lions. One of the success stories of the season was the signing of former Flamengo FC player Cássio on a free transfer from Brazilian club. Cássio, who joined from Santa Cruz FC, won the Club Champion award in his first season. Shaun Ontong and Matthew Mullen from the AIS, were also signed to replenish their defensive stocks after the departure of Kristian Rees, Adam van Dommele and Aaron Goulding.

The 2007–08 season was a season to forget for Adelaide as they battled a huge amount of player injury throughout the season. This effectively ended their finals hopes and it was the first time Adelaide had failed to make the top two in A-League history.

Adelaide United participated in the 2008 AFC Champions League after finishing runner-up in the 2006–07 regular season and finals series to Melbourne Victory. Adelaide was drawn into Group E, along with V-League and Super Cup winners Bình Dương F.C., CSL champions Changchun Yatai, and K-League winners Pohang Steelers.

...
Wikipedia