During the 2003–04 English football season, Portsmouth F.C. competed in the Premier League. It was their first ever season in the Premiership and the first in English football's top flight since the 1987–88 season.

Portsmouth's Premiership debut (and only their second top division campaign during the last 45 years) was a fine one, as they finished 13th and established Fratton Park as one of the hardest Premiership grounds to get a result at. Only their dismal away form (with only two away wins all season) prevented them from finishing even higher and challenging for a European place, but it was still a very good season for the only newly promoted side to preserve their Premiership status.

After a good start to the season which saw Portsmouth top of the Premiership after three games, the team slumped into the relegation zone, but rallied and only lost one of their last ten matches to finish 13th - ahead of more established sides like Everton, Manchester City, Blackburn Rovers and Tottenham Hotspur. To their credit, they were one of the only two teams to remain unbeaten against Arsenal's "Invincibles" in the league during the season.

Portsmouth introduced a new kit for the season, still manufactured under the club's own brand, Pompey Sport. ty remained the kit sponsors.

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

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