The 2009–10 season was Bolton Wanderers 11th season in the Premier League, and their ninth consecutive season in the top division of English football and covers the period from 1 July 2009 to 30 June 2010. Bolton Wanderers failed to win the Premier League 2009–10 title, making it the 71st time that they have competed at the top level without winning the title, the most of any club.

The team kit for the 2009–10 season was produced by Reebok who were replaced as shirt sponsor by 188BET after nineteen years. Reebok still held naming rights to the stadium. To reflect the change in sponsor the home kit was changed to an all-white body with black vertical lines nearer the bottom. The away kit was the same as the home but blue, whilst the 188bet logo was white.

Bolton confirmed that they would not be taking up the option of signing Euzebiusz Smolarek, Sébastien Puygrenier or Ariza Makukula after the end of the previous season, and all returned to their parent clubs.

Bolton announced on 6 May 2009 that long serving goalkeeper Jussi Jääskeläinen had been granted a testimonal against Hibernian at the Reebok Stadium on 8 August. This was later followed by an announcement that the club would play Hibs' neighbours Hearts at Tynecastle four days earlier. On 12 June, the club published its full set of pre-season fixtures which included a three-game tour of Germany and the Netherlands, where the team met Borussia Mönchengladbach, Den Bosch and FC Eindhoven. Local fixtures were organised against Leigh Genesis, Altrincham, Fleetwood Town and Chorley.

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