The 2011–12 Adelaide United FC season was the clubs seventh A-League season. It includes the 2011–12 A-League season as well as any other competitions of the 2011–12 football season.

As of 1 April 2011, all A-League clubs were able to negotiate new kit supplier deals as the previous contract with Reebok had elapsed and as such, Adelaide United negotiated a three-year deal with Erreà.

Off-season transfers marked the departure of long serving players Travis Dodd, Lucas Pantelis and Robert Cornthwaite, and of fan favourites Mathew Leckie and Marcos Flores to overseas clubs. In a coup for the club and the A-League, Rini Coolen managed to secure the signatures of Socceroos Bruce Djite, Jon McKain and Dario Vidošić; with the latter being offered the Australian marquee player status at the club for the season. The signing of Ukrainian international, Evgeniy Levchenko completed Adelaide's foreign player quota.

It was announced at the season launch gala dinner on 26 August that the club's captain for the season would be Jon McKain, with Cássio and Eugene Galeković named as vice-captains.

During the last weeks of the off-season in September, Adelaide recruited its final players to complete the squad for the season. Ricardo Da Silva was scouted and signed from local South Australian Super League outfit, Adelaide City, whilst double-winning defenders Milan Susak and Antony Golec were signed to add extra depth to the squad.

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