Huddersfield Town's 2009–10 campaign was the club's first full season under the chairmanship of Dean Hoyle, with manager Lee Clark in his first full season in charge of the team. They finished in 6th place, before losing to Millwall in the play-offs.

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After the end of the centenary season, Dean Hoyle made wholesale changes at the club. As well as the retirement of Andy Booth, Clark released Jon Worthington, Malvin Kamara, Dominik Werling, Daniel Broadbent, Dan Codman. Danny Cadamarteri and Andy Holdsworth both rejected new deals and subsequently left the club. Cadamarteri joined Scottish Premier League side Dundee United, then a week later, ex-captain Worthington joined fellow League One side Oldham Athletic. On 16 July, young striker Tom Denton joined Football League Two side Cheltenham Town on a six-month loan deal. He returned to the club on 10 November, two months earlier than anticipated. On 22 July, midfielder Ian Craney and striker Phil Jevons joined League Two side Morecambe on season-long loans. Unfortunately, an injury cut short half of Craney's season, and he returned to the Galpharm on 20 April. The following day, his contract at the club was terminated. Also that day, Keigan Parker and Andy Holdsworth joined Oldham Athletic, following Jon Worthington. On 25 July, young goalkeeper Simon Eastwood joined Bradford City on loan until the end of the year. He returned to the Galpharm on 31 December. On 4 August, Eastwood was joined at Bradford by Michael Flynn after terminating his contract at the Galpharm. Kamara joined Conference National side Barrow on 25 September. On 14 December, young defender Spencer Harris moved to Northern Premier League Division One North side Curzon Ashton on a month's loan. On 1 January 2010, midfielder Jim Goodwin joined Oldham Athletic on a month's loan, which was extended to the end of the season on 1 February. On 7 January, defender Andy Butler joined Championship side Blackpool on loan until the end of the season. On 13 January, goalkeeper Matt Glennon terminated his contract with the Terriers, so he could join Bradford City on a permanent deal. On 21 January, left-back Joe Skarz joined League Two side Shrewsbury Town on loan until the end of the season. The following day, 2 of the team's youngsters, Jack Hunt & Leigh Franks were sent on loan to Conference National side Grays Athletic and Conference North side Fleetwood Town respectively. On 27 January, Lionel Ainsworth joined fellow League One side Brentford on a month's loan, which was extended to the end of the season on 1 February. On 1 February, Tom Denton and Lewis Nightingale joined Northern Premier League Division One North side Wakefield on one-month loans. On 17 March, young defender Spencer Harris was released from his contract, then signed for Ossett Town. On 17 May 2010, former captain Chris Lucketti left the club.

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