The 2009–10 season was Leicester City F.C.'s 105th season in the English football league system and their 58th in the second tier of English football. It was their first season back in the Championship after promotion from League One as champions in 2008–09. It was also the club's 125th anniversary season.

Having just been promoted, Nigel Pearson's side surprised many by spending most of the season in the play-offs. They eventually finished fifth, reaching the play-offs. This was considered an impressive finish and a stride forward by many, considering Leicester were relegated from the same division two seasons previously. They eventually lost out in the play-off semi-finals to Cardiff City on a penalty shoot-out.

After winning League One by seven points, manager Nigel Pearson sought to strengthen the squad ahead of the Championship campaign. 2008–09 loanees Jack Hobbs and Wayne Brown were quickly signed on permanent deals from Liverpool and Hull City respectively. Veterans Barry Hayles, Bruno N'Gotty, Paul Henderson, Patrick Kisnorbo and Marc Edworthy were released at the end of their contracts. The Foxes further added to their squad with the captures of goalkeeper Chris Weale, defender Robbie Neilson and midfielders Richie Wellens and Dany N'Guessan. However, the forward line remained unreinforced until 19-year-old Martyn Waghorn arrived on loan from Sunderland just before the opening game against Swansea City.

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