Sheffield United Football Club (known as the Blades) participated in League One, the third level of English football for the first time in 23 years having been relegated from the Championship at the end of the previous season. It was also their first appearance in both the Football League Trophy and the first round proper of the FA Cup for a similar length of time, as well as being the first season under new manager Danny Wilson. United began the season well, recording consistently sound results in Football League One and nearing the position required for an immediate return to the Championship. By the turn of the year, the squad was well positioned for promotion.

Reasonable progress was made in the cup competitions, reaching the second round of the League Cup, the fourth round of the FA Cup and the regional quarter finals of the Football League Trophy. With only a handful of games left to play in the league, United looked set to finish in second place in the table but in the aftermath of leading scorer Ched Evans being jailed, results declined, and United slipped to third place in the final week of the season. Although reaching the Play-off Final the team were beaten on penalties by Huddersfield Town at Wembley Stadium, thus failing to achieve promotion and being destined to spend the following season in League One.

The team kit for the 2011–12 season was produced by Macron for the third successive year. The home kit consisted of the club's traditional red and white stripes and was based on the kit worn by the team in the early 1970s, chosen following a poll of fans the previous year. As the pre-season programme got under way the club also revealed a new all yellow away kit. By mid July the club announced that they had struck a joint sponsorship deal with cross-city rivals Sheffield Wednesday which would see both teams sponsored by the same two local companies. The Blades home kit was sponsored by Westfield Health and the away kit by local car dealers Gilders Group (with Sheffield Wednesday's kit's having the reverse). The club later announced that a new secondary sponsor, Nexis, would appear on the back of the home shirts for the coming season.

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