2021–22 Peterborough United F.C. season

The 2021–22 season is Peterborough United's 88th year in their history and first season back in the Championship since the 2012–13 following promotion last season. Along with the league, the club will also compete in the FA Cup and the EFL Cup. The season covers the period from 1 July 2021 to 30 June 2022.

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

Statistics
!colspan=15|Players out on loan:

!colspan=15|Player who left the club:


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Pre-season friendlies
As part of their pre-season preparations, Peterborough United announced friendly matches against Bedford Town, Stamford, Gillingham, Barnet, double header with Oxford United, Portsmouth, Swindon Town and King's Lynn Town.

Matches
Peterborough United's fixtures were announced on 24 June 2021.

FA Cup
Peterborough United were drawn at home to Bristol Rovers in the third round.

EFL Cup
Peterborough United were drawn at home to Plymouth Argyle in the first round.