| Date | Player | From | To | Type / Fee |
|---|---|---|---|---|
| Jan 25, 2021 | Sokratis Papastathopoulos |  Arsenal |  Olympiacos | Free transfer |
| Jan 22, 2021 | Mathew Ryan |  Brighton | Arsenal | Loan |
| Jan 8, 2021 | Matt Macey | Arsenal |  Hibernian | Free transfer |
| Jan 4, 2021 | Sead Kolasinac | Arsenal |  Schalke 04 | Loan |
| Jan 4, 2021 | William Saliba | Arsenal |  Nice | Loan |
| Oct 8, 2020 | Dejan Iliev | Arsenal |  Shrewsbury | Loan |
| Oct 5, 2020 | Thomas Partey |  Atletico Madrid | Arsenal | Transfer €50M |
| Oct 5, 2020 | Matteo Guendouzi | Arsenal |  Hertha Berlin | Loan €1M |
| Oct 5, 2020 | Lucas Torreira | Arsenal | Atletico Madrid | Loan |
| Sep 21, 2020 | Runar Alex Runarsson |  Dijon | Arsenal | Transfer €2M |
| Sep 16, 2020 | Emiliano Martinez | Arsenal |  Aston Villa | Transfer €17.4M |
| Sep 1, 2020 | Gabriel |  Lille | Arsenal | Transfer €26M |
| Sep 1, 2020 | Henrikh Mkhitaryan | Arsenal |  Roma | Free transfer |
| Aug 31, 2020 | Henrikh Mkhitaryan | Roma | Arsenal | End of loan |
| Aug 14, 2020 | Willian |  Chelsea | Arsenal | Free transfer |
| Aug 3, 2020 | Mohamed Elneny |  Besiktas | Arsenal | End of loan |
| Aug 1, 2020 | Emile Smith Rowe |  Arsenal Academy | Arsenal | Transfer |
| Jul 31, 2020 | Dejan Iliev |  Jagiellonia Bialystok | Arsenal | End of loan |
| Jul 16, 2020 | Konstantinos Mavropanos | Arsenal |  VfB Stuttgart | Loan €750K |
| Jul 12, 2020 | Konstantinos Mavropanos |  Nuernberg | Arsenal | End of loan |
| Jul 1, 2020 | Pablo Mari |  Flamengo | Arsenal | Transfer €6M |
| Jul 1, 2020 | Cedric Soares |  Southampton | Arsenal | Free transfer |
| Jun 30, 2020 | Cedric Soares | Arsenal | Southampton | End of loan |
| Jun 30, 2020 | William Saliba |  Saint-Etienne | Arsenal | End of loan |
| Jun 30, 2020 | Pablo Mari | Arsenal | Flamengo | End of loan |
