| 2026-10-15 | Ejiro Abbey | Peterborough → Spalding United | Loan |
| 2026-10-12 | A. Changunda | Peterborough → Braintree | Transfer |
| 2026-08-31 | G. Nevett | Peterborough → Tranmere | Loan |
| 2026-08-31 | K. Lolos | Peterborough → Rotherham | Loan |
| 2026-08-31 | David Kamara | Peterborough → Tranmere | Loan |
| 2026-08-31 | Harry Ashfield | Wrexham → Peterborough | Transfer |
| 2026-08-30 | Joshua Feeney | Aston Villa → Peterborough | Loan |
| 2026-08-30 | E. Chang | Peterborough → Chang Edward | Free agent |
| 2026-08-25 | D. Ormerod | AFC Fylde → Peterborough | Transfer |
| 2026-08-13 | Joseph Andrews | Peterborough → Chesham United | Loan |
| 2026-08-12 | A. Collins | Peterborough → Huddersfield | Free agent |
| 2026-08-12 | L. Kelly | Milton Keynes Dons → Peterborough | Transfer |
| 2026-08-12 | Ethan Williams | Manchester United → Peterborough | Transfer |
| 2026-08-12 | Vernon Masara | Burnley → Peterborough | Transfer |
| 2026-07-29 | T. Lees | Peterborough → Harrogate Town | Free agent |
| 2026-07-25 | K. Lisbie | Peterborough → Millwall | Transfer |
| 2026-07-24 | B. Westcott | Peterborough → AFC Bournemouth (U21) | - |
| 2026-07-23 | K. Roudette Gregory | Peterborough → Deportivo Lara | - |
| 2026-07-09 | P. Aderoju | Peterborough → Crawley Town | Loan |
| 2026-07-09 | J. Mendy | Peterborough → Bromley | Free agent |
| 2026-07-08 | B. Ihionvien | Peterborough → Colchester | Loan |
| 2026-07-01 | C. Hayes | Peterborough → Rochdale | Transfer |
| 2026-07-01 | A. Odoh | Peterborough → Salford City | Transfer |
| 2026-06-30 | T. O'Connor | Wrexham → Peterborough | Free agent |
| 2026-06-30 | Harrison Jones | Sunderland → Peterborough | Transfer |
| 2026-06-30 | O. Edwards | Colchester → Peterborough | Free agent |
| 2026-06-30 | E. Weir | Walsall → Peterborough | Free agent |
| 2026-06-30 | Kovaci | Peterborough → Vora | Free agent |
| 2026-06-29 | A. Collins | Peterborough → Collins Archie | Free agent |
| 2026-06-29 | T. Lees | Peterborough → Lees Tom | Free agent |
| 2026-06-29 | T. Lees | Peterborough → Harrogate Town | Free agent |
| 2026-06-29 | J. Mendy | Peterborough → Bromley | Free agent |
| 2026-06-29 | A. Changunda | Peterborough → Braintree | Transfer |
| 2026-06-29 | F. Claxton | Peterborough → Claxton Fabian | Free agent |
| 2026-05-30 | B. Ihionvien | Shrewsbury → Peterborough | Return from loan |
| 2026-05-30 | C. Conn-Clarke | Carlisle → Peterborough | Return from loan |
| 2026-05-30 | P. Kioso | Peterborough → Oxford United | Return from loan |
| 2026-05-30 | K. Lolos | Crawley Town → Peterborough | Return from loan |
| 2026-05-30 | J. Morgan | Peterborough → Chelsea (U21) | Return from loan |
| 2026-05-30 | J. Morgan | Peterborough → Chelsea | Return from loan |
| 2026-03-30 | Joseph Andrews | Brackley Town → Peterborough | Return from loan |
| 2026-02-27 | Joseph Andrews | Peterborough → Brackley Town | Loan |
| 2026-02-26 | David Kamara | Harborough Town → Peterborough | Return from loan |
| 2026-02-05 | N. Bilokapić | Peterborough → Ipswich Town (U21) | - |
| 2026-02-01 | J. Mendy | Wrexham → Peterborough | Transfer |
| 2026-02-01 | T. O'Connor | Peterborough → Wrexham | Return from loan |
| 2026-01-31 | J. Mendy | Peterborough → Wrexham | Return from loan |
| 2026-01-31 | W. Blackmore | Peterborough → Blackmore Will | Free agent |
| 2026-01-28 | G. Lindgren | Peterborough → BK Hacken | Transfer |
| 2026-01-12 | Ejiro Abbey | Peterborough → Peterborough | Free agent |
| 2026-01-08 | K. Lolos | Peterborough → Crawley Town | Loan |
| 2026-01-02 | P. Aderoju | Eastbourne Borough → Peterborough | Return from loan |
| 2026-01-02 | R. De Havilland | Peterborough → Bristol Rovers | Transfer |
| 2026-01-02 | C. Conn-Clarke | Carlisle → Peterborough | Return from loan |
| 2026-01-01 | V. Reyes | Peterborough → Norwich | Return from loan |