| 2026-08-30 | K. Stratznig | First Vienna → Voitsberg | Transfer |
| 2026-07-29 | Dean Titkov | First Vienna → Gandzasar | Free agent |
| 2026-07-21 | O. Okungbowa | First Vienna → Lamphun Warrior | Free agent |
| 2026-07-20 | I. Jung | Schalke 04 II → First Vienna | Free agent |
| 2026-07-19 | A. Abdijanovic | First Vienna → Floridsdorfer AC | - |
| 2026-07-14 | F. Mrzljak | FC UFA → First Vienna | Free agent |
| 2026-07-13 | Vincent Zeidler | First Vienna → Donau | Loan |
| 2026-07-06 | Y. Soukouna | Concarneau → First Vienna | Free agent |
| 2026-07-05 | Kelechi Nnamdi | First Vienna → Sturm Graz II | - |
| 2026-07-01 | R. Marte | Schwarz-Weiß Bregenz → First Vienna | Free agent |
| 2026-06-30 | C. Giuliani | First Vienna → FC BW Linz | Transfer |
| 2026-06-30 | N. Szerencsi | First Vienna → SKN ST. Polten | - |
| 2026-06-30 | Seo Jong-Min | First Vienna → FC Ingolstadt 04 | Free agent |
| 2026-06-30 | L. Dantas | First Vienna → Schwarz-Weiß Bregenz | Free agent |
| 2026-06-30 | Marlon Winter | Velden → First Vienna | - |
| 2026-06-30 | T. Gruber | Wolfsberger AC II → First Vienna | Transfer |
| 2026-06-30 | T. Anselm | WSG Wattens → First Vienna | Transfer |
| 2026-06-30 | F. Luckeneder | SV Wehen → First Vienna | Free agent |
| 2026-06-30 | K. Kretschmer | Schwarz-Weiß Bregenz → First Vienna | Free agent |
| 2026-06-30 | M. Fillafer | TSV Hartberg → First Vienna | Free agent |
| 2026-06-30 | P. Breit | SV Kapfenberg → First Vienna | Free agent |
| 2026-06-30 | Pistrol Santino | First Vienna → Hoffenheim II | - |
| 2026-06-29 | N. Alozie | First Vienna → Wiener Viktoria | Free agent |
| 2026-06-29 | D. Velimirović | Rapid Vienna → First Vienna | Free agent |
| 2026-06-29 | J. Kitenge | First Vienna → Kitenge Joel | Free agent |
| 2026-06-29 | J. Kitenge | SV Horn → First Vienna | Return from loan |
| 2026-06-29 | J. Kitenge | First Vienna → Mattersburg SV 2020 | Transfer |
| 2026-06-29 | M. Rusek | First Vienna → SC Wiener Neustadt | Free agent |
| 2026-06-29 | L. Birkhahn | Fach-Donaufeld → First Vienna | Return from loan |
| 2026-06-29 | Dean Titkov | First Vienna → Titkov Dean | Free agent |
| 2026-06-29 | Dean Titkov | Donau → First Vienna | Return from loan |
| 2026-06-29 | Dean Titkov | First Vienna → Gandzasar | Free agent |
| 2026-06-29 | H. Zahirovic | First Vienna → Donau | Free agent |
| 2026-06-29 | M. Odagaki | First Vienna → Mannsdorf-Großenzersdorf | Free agent |
| 2026-04-01 | M. Jerabek | First Vienna → First Vienna | - |
| 2026-03-23 | A. Omerović | First Vienna → Velež | Free agent |
| 2026-02-05 | Dean Titkov | First Vienna → Donau | Loan |
| 2026-02-03 | M. Mergner | Bayern München → First Vienna | Free agent |
| 2026-01-31 | F. Prohart | SV Kapfenberg → First Vienna | Transfer |
| 2026-01-29 | Recep Yalın Dilek | First Vienna → Galatasaray | Return from loan |
| 2026-01-29 | P. Schmidt | First Vienna → Tarxien Rainbows | Free agent |
| 2026-01-23 | A. Stogiannidis | First Vienna → Favoritner AC | Free agent |
| 2026-01-18 | B. Susso | First Vienna → Aluminij | Free agent |
| 2026-01-16 | M. Djuričin | First Vienna → SKN ST. Polten | Free agent |
| 2026-01-13 | M. Odagaki | Traiskirchen → First Vienna | Transfer |
| 2026-01-12 | L. Birkhahn | First Vienna → Fach-Donaufeld | Loan |
| 2026-01-12 | M. Gantschnig | Grazer AK → First Vienna | Transfer |