| 2026-09-08 | E. Vergani | Frosinone → Perugia | Free agent |
| 2026-09-07 | A. Cichero | Frosinone → Paradiso | Loan |
| 2026-09-02 | I. Koutsoupias | Frosinone → Anderlecht | Transfer |
| 2026-09-01 | I. Koutsoupias | Frosinone → Anderlecht | Transfer |
| 2026-08-31 | K. Barcella | Frosinone → Crotone | Loan |
| 2026-08-27 | T. Bobček | Lechia Gdansk → Frosinone | Transfer |
| 2026-08-26 | Muhammed Colley | Frosinone → Casertana | Loan |
| 2026-08-26 | T. Bobček | Lechia Gdansk → Frosinone | Transfer |
| 2026-08-26 | D. Bîrligea | FCSB → Frosinone | Loan |
| 2026-08-25 | N. Corrado | Frosinone → Empoli | Loan |
| 2026-08-25 | Filippo Grosso | Frosinone → Crotone | Loan |
| 2026-08-24 | J. Oyono | Frosinone → Spezia | Loan |
| 2026-08-24 | E. Tchato | Montpellier → Frosinone | Transfer |
| 2026-08-23 | E. Tchato | Montpellier → Frosinone | Transfer |
| 2026-08-20 | S. Kalaj | Frosinone → Spezia | Transfer |
| 2026-08-20 | Toci Matteo | Frosinone → Scandicci | Free agent |
| 2026-08-18 | Omar Fayed | Fenerbahçe → Frosinone | Transfer |
| 2026-08-17 | E. Masciangelo | Frosinone → Catania | Free agent |
| 2026-08-17 | Omar Fayed | Fenerbahçe → Frosinone | Transfer |
| 2026-08-13 | A. Terzić | Red Bull Salzburg → Frosinone | Transfer |
| 2026-08-12 | A. Terzić | Red Bull Salzburg → Frosinone | Transfer |
| 2026-08-11 | R. Schmid | Werder Bremen → Frosinone | Transfer |
| 2026-08-11 | F. Grillitsch | SC Braga → Frosinone | Free agent |
| 2026-08-10 | R. Schmid | Werder Bremen → Frosinone | Transfer |
| 2026-08-10 | F. Grillitsch | SC Braga → Frosinone | Free agent |
| 2026-08-09 | P. Masini | Genoa → Frosinone | Loan |
| 2026-08-04 | M. Obleac | Frosinone → Casarano | Transfer |
| 2026-08-03 | M. Obleac | Frosinone → Casarano | Transfer |
| 2026-07-31 | K. Akpoguma | 1899 Hoffenheim → Frosinone | Free agent |
| 2026-07-23 | A. Zerbin | Napoli → Frosinone | Transfer |
| 2026-07-23 | L. Hasa | Napoli → Frosinone | Transfer |
| 2026-07-17 | S. Desplanches | Palermo → Frosinone | Loan |
| 2026-07-13 | Lorenzo Gori | Frosinone → Grosseto | Loan |
| 2026-07-12 | A. El Azzouzi | Fortuna Düsseldorf → Frosinone | Free agent |
| 2026-07-11 | G. Cittadini | Atalanta → Frosinone | Loan |
| 2026-07-11 | G. Calvani | Genoa → Frosinone | Loan |
| 2026-07-11 | S. Fini | Genoa → Frosinone | Loan |
| 2026-07-11 | A. El Azzouzi | Fortuna Düsseldorf → Frosinone | Free agent |
| 2026-07-10 | Abdoulie Ndow | Frosinone → Spezia | Transfer |
| 2026-07-07 | R. Marchizza | Frosinone → Vicenza Virtus | Free agent |
| 2026-07-06 | W. Amey | Bologna → Frosinone | Loan |
| 2026-06-30 | A. Selvini | Frosinone → Pineto | Transfer |
| 2026-06-30 | D. Biraschi | Frosinone → Fatih Karagümrük | Transfer |
| 2026-06-29 | A. Selvini | Forli → Frosinone | Return from loan |
| 2026-06-29 | A. Selvini | Frosinone → Pineto | Transfer |
| 2026-06-29 | G. Cittadini | Frosinone → Atalanta | Return from loan |
| 2026-06-29 | D. Biraschi | Fatih Karagümrük → Frosinone | Return from loan |
| 2026-06-29 | S. Kalaj | Frosinone → Laci | - |
| 2026-06-29 | R. Marchizza | Frosinone → Marchizza Riccardo | Free agent |
| 2026-06-29 | R. Marchizza | Frosinone → Vicenza Virtus | Free agent |
| 2026-06-29 | B. Kone | Frosinone → Como | Return from loan |
| 2026-06-29 | G. Calvani | Frosinone → Genoa | Return from loan |
| 2026-06-29 | E. Masciangelo | Frosinone → Masciangelo Edoardo | Free agent |
| 2026-06-29 | E. Masciangelo | Frosinone → Catania | Free agent |
| 2026-06-29 | A. Raimondo | Frosinone → Bologna | Return from loan |
| 2026-06-29 | S. Fini | Frosinone → Genoa | Return from loan |
| 2026-06-29 | A. Fiori | Frosinone → Mantova | Return from loan |
| 2026-06-29 | M. Pisseri | Frosinone → Pisseri Matteo | Free agent |
| 2026-06-29 | G. Calò | Frosinone → Cesena | Return from loan |
| 2026-06-29 | M. Zilli | Frosinone → Cosenza | Return from loan |
| 2026-06-29 | E. Vergani | Frosinone → Vergani Edoardo | Free agent |
| 2026-02-26 | Victor Hegelund | Frosinone → Middelfart | Free agent |
| 2026-02-04 | Nicolo Cesari | Frosinone → Albalonga | Free agent |
| 2026-01-29 | D. Dixon O'Neill | Frosinone → Toronto FC | Loan |
| 2026-01-26 | Victor Hegelund | Frosinone → Hegelund Victor | Free agent |
| 2026-01-26 | Victor Hegelund | Frosinone → Middelfart | Free agent |
| 2026-01-25 | S. Fini | Genoa → Frosinone | Loan |
| 2026-01-24 | A. Fiori | Mantova → Frosinone | Loan |
| 2026-01-21 | D. Biraschi | Frosinone → Fatih Karagümrük | Loan |
| 2026-01-21 | A. Raychev | Frosinone → Pisa | Return from loan |
| 2026-01-07 | A. Selvini | Frosinone → Forli | Loan |
| 2026-01-03 | A. Sherri | Frosinone → Cagliari | Return from loan |