2023–24 Portsmouth F.C. season

The 2023–24 season was Portsmouth's seventh consecutive season in League One and celebrated as their 125th anniversary as a football club. In addition to the domestic league, Portsmouth also competed in the FA Cup, the EFL Cup, and the EFL Trophy.

On 16 April 2024, Portsmouth were crowned champions of EFL League One and were promoted to the EFL Championship. The EFL League One champions trophy was presented at Fratton Park on 20 April 2024 after the conclusion of the final home game of the season against Wigan.

Pre-season and friendlies
On 17 May, Pompey announced their pre-season schedule, with matches against Bristol City, Bognor Regis Town, Gosport Borough and Havant & Waterlooville confirmed along with a training camp in southern Spain between 2–7 July. A day later, the club confirmed a trip to AFC Wimbledon. On 12 June, a friendly during their training camp was confirmed, against Europa.

Matches
On 22 June, the EFL League One fixtures were released.

FA Cup
Portsmouth were drawn away to Chesterfield in the first round.

EFL Cup
Pompey were drawn away to Forest Green Rovers in the first round and at home to Peterborough United in the second round.

EFL Trophy
In the group stage, Portsmouth were drawn into Southern Group E alongside Gillingham, Leyton Orient and Fulham U21. After topping their group, they were drawn at home to AFC Wimbledon in the second round.