Sheffield United Football Club participated in League One, the third level of English football in 2012–13, after having failed to win promotion, losing in the previous season's play-off final. Danny Wilson remained in charge for a second season and the club continued to reduce costs as they sought to adapt to life at the third level of English football. Many of the players involved in the previous season were either sold or released, while the likes of Nick Blackman, Tony McMahon, Shaun Miller and Dave Kitson were signed to replace them.

The team went unbeaten in the league until November, briefly climbing to the top of the table, and returned to first place once again over the Christmas period. United had little success in the various cup competitions however, as they were beaten in the first round of the Football League Cup by Burton Albion, and by Coventry City in the Football League Trophy. They did manage to reach the fourth round of the FA Cup but were comprehensively beaten by Reading, a result which came amidst a rapid downturn in league form during January, that almost saw United almost drop out of the play-off places. After a brief recovery through February, the decline in results continued and following another string of poor results in April, Danny Wilson was dismissed as manager, with coach Chris Morgan being appointed as caretaker for the remainder of the season.

Despite the change of manager, United's form did not significantly improve and they finished the season in 5th place in the league, thus facing Yeovil Town in the play-offs. Having beaten Yeovil 1–0 in the first leg, they were defeated by two goals in the second and as such were consigned to remain in League One for at least another season.

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