The 2009–10 season was Portsmouth's 111th in existence, their seventh season in the Premier League and their seventh consecutive season in the top division of English football. It was a season in which the club struggled with financial problems and entered administration.

The club finished at 20th place in the league, a place they had since the second round, which meant relegation to The Championship. Portsmouth managed to only receive points in 14 of the 38 games, in which seven were wins. In March they were docked nine points for entering administration.

Portsmouth's biggest success in the season came in the 2009–10 FA Cup, in which they manage to advance to the final after beating Coventry, Sunderland, Southampton, Birmingham and Tottenham Hotspur in the semi-final. They played at Wembley Stadium in the final against Chelsea, a game that Chelsea won by 1–0. Portsmouth also participated in the League Cup and reached the quarter-finals.

Manager Paul Hart was sacked in November and replaced by Avram Grant, who stayed until the end of the season. French striker Frédéric Piquionne scored eleven goals throughout the season and was the club's top goalscorer.

The team kit is produced by Canterbury of New Zealand and the shirt sponsor is Jobsite. On 8 April 2010, Portsmouth FC announced a new five-year kit supply deal with Kappa. They wore the Kappa strip for the first time in the FA Cup Semi Final on 11 April 2010.

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