| 04 Oct 18 | R. Mahazi Rashid Mahazi | XXX | → |  Western Sydney WanderersWSW | Free |
| 19 Sept 18 | R. McCormack Ross McCormack |  Aston VillaAVL | → |  Central Coast MarinersCCM | Loan |
| 19 Sept 18 | R. McCormack Ross McCormack | Aston VillaAVL | → | Central Coast MarinersCCM | Loan |
| 18 Sept 18 | C. Good Curtis Good |  Newcastle UnitedNEW | → |  Melbourne City FCMCY | Free |
| 18 Sept 18 | C. Good Curtis Good | Newcastle UnitedNEW | → | Melbourne City FCMCY | Free |
| 14 Sept 18 | M. Austin Mitch Austin |  Melbourne VictoryMVC | → |  Newcastle JetsNEW | Free |
| 14 Sept 18 | R. de Laet Ritchie de Laet | Aston VillaAVL | → | Melbourne City FCMCY | Loan |
| 14 Sept 18 | R. de Laet Ritchie de Laet | Aston VillaAVL | → | Melbourne City FCMCY | Loan |
| 23 Aug 18 | S. de Jong Siem de Jong |  Ajax AmsterdamAJA | → |  Sydney FCSYD | Loan |
| 23 Aug 18 | S. de Jong Siem de Jong | Ajax AmsterdamAJA | → | Sydney FCSYD | Loan |
| 17 Aug 18 | A. Le Fondre Adam Le Fondre |  Bolton WanderersBOL | → | Sydney FCSYD | Free |
| 17 Aug 18 | A. Le Fondre Adam Le Fondre | Bolton WanderersBOL | → | Sydney FCSYD | Free |
| 10 Aug 18 | A. Baumjohann Alexander Baumjohann |  VitóriaVIT | → | Western Sydney WanderersWSW | Free |
| 10 Aug 18 | A. Baumjohann Alexander Baumjohann | VitóriaVIT | → | Western Sydney WanderersWSW | Free |
| 09 Aug 18 | D. Arzani Daniel Arzani | Melbourne City FCMCY | → |  Manchester CityMNC | Undisclosed |
| 09 Aug 18 | D. Arzani Daniel Arzani | Melbourne City FCMCY | → | Manchester CityMNC | Undisclosed |
| 06 Aug 18 | K. Honda Keisuke Honda |  PachucaPAC | → | Melbourne VictoryMVC | Free |
| 06 Aug 18 | K. Honda Keisuke Honda | PachucaPAC | → | Melbourne VictoryMVC | Free |
| 31 Jul 18 | S. Galloway Scott Galloway |  Wellington Phoenix FCWEL | → |  Adelaide UnitedADE | Free |
| 25 Jul 18 | D. De Silva Danny De Silva | Central Coast MarinersCCM | → | Sydney FCSYD | Loan |
| 25 Jul 18 | M. Kopczynski Michal Kopczynski | LWXLegia WarsawLegia Warsaw | → | Wellington Phoenix FCWEL | Loan |
| 24 Jul 18 | P. Ziegler Patrick Ziegler | FKXFC KaiserslauternFC Kaiserslautern | → | Western Sydney WanderersWSW | Free |
| 23 Jul 18 | D. Williams David Williams | SHXSzombathelyi HaladasSzombathelyi Haladas | → | Wellington Phoenix FCWEL | Undisclosed |
| 23 Jul 18 | M. Nichols Mitch Nichols |  PerselaLAM | → | Wellington Phoenix FCWEL | Free |
| 20 Jul 18 | N. Ansell Nicholas Ansell |  TondelaTON | → | Melbourne VictoryMVC | Undisclosed |
| 20 Jul 18 | Juande |  SpeziaSPE | → |  Perth GloryPER | Free |
| 19 Jul 18 | G. Niedermeier Georg Niedermeier |  SC FreiburgFREI | → | Melbourne VictoryMVC | Free |
| 19 Jul 18 | G. Niedermeier Georg Niedermeier | SC FreiburgFREI | → | Melbourne VictoryMVC | Free |
| 18 Jul 18 | F. Kurto Filip Kurto |  Roda JC KerkradeRJC | → | Wellington Phoenix FCWEL | Undisclosed |
| 12 Jul 18 | R. Williams Rhys Williams | Melbourne VictoryMVC | → | AFXAl-Qadsiah FCAl-Qadsiah FC | Undisclosed |
| 10 Jul 18 | F. Ferreira Fábio Ferreira | Sydney FCSYD | → | Perth GloryPER | Free |
| 10 Jul 18 | S. Taylor Steven Taylor |  Peterborough UnitedPET | → | Wellington Phoenix FCWEL | Free |
| 29 Jun 18 | B. Berisha Besart Berisha | Melbourne VictoryMVC | → |  Sanfrecce HiroshimaSAN | Undisclosed |
| 19 Jun 18 | B. Santalab Brendon Santalab | Western Sydney WanderersWSW | → | Perth GloryPER | Free |
| 18 Jun 18 | M. O'Halloran Michael O'Halloran |  RangersRAN | → | Melbourne City FCMCY | Undisclosed |
| 18 Jun 18 | M. O'Halloran Michael O'Halloran | RangersRAN | → | Melbourne City FCMCY | Undisclosed |
| 08 Jun 18 | C. Theoharous Christian Theoharous | Melbourne VictoryMVC | → |  Borussia MonchengladbachMON | Undisclosed |
| 08 Jun 18 | C. Theoharous Christian Theoharous | Melbourne VictoryMVC | → | Borussia MonchengladbachMON | Undisclosed |
| 04 Jun 18 | S. Mauk Stefan Mauk |  NEC NijmegenNEC | → |  Brisbane RoarBRR | Free |
| 26 May 18 | C. Goodwin Craig Goodwin |  Sparta RotterdamSPA | → | Adelaide UnitedADE | Undisclosed |
| 26 May 18 | C. Goodwin Craig Goodwin | Sparta RotterdamSPA | → | Adelaide UnitedADE | Undisclosed |
| 23 May 18 | J. Absalonsen Johan Absalonsen | Adelaide UnitedADE | → |  SonderjyskeSON | Undisclosed |
| 14 May 18 | M. Jakobsen Michael Jakobsen | Melbourne City FCMCY | → | Adelaide UnitedADE | Free |
| 03 May 18 | B. Kamau Bruce Kamau | Melbourne City FCMCY | → | Western Sydney WanderersWSW | Free |
| 03 May 18 | N. Fitzgerald Nick Fitzgerald | Melbourne City FCMCY | → | Western Sydney WanderersWSW | Free |
| 03 May 18 | R. Tongyik Ruon Tongyik | Melbourne City FCMCY | → | Western Sydney WanderersWSW | Free |
| 04 Mar 18 | A. Nabbout Andrew Nabbout | Newcastle JetsNEW | → |  Urawa Red DiamondsURA | Undisclosed |
| 07 Feb 18 | D. Cavusevic Dzengis Cavusevic |  FC ZürichZUR | → | Adelaide UnitedADE | Free |
| 02 Feb 18 | Fábio Ferreira | XXX | → | Sydney FCSYD | Free |
| 31 Jan 18 | M. Patterson Monty Patterson |  Ipswich TownIPS | → | Wellington Phoenix FCWEL | Loan |
| 31 Jan 18 | M. Patterson Monty Patterson | Ipswich TownIPS | → | Wellington Phoenix FCWEL | Loan |
| 31 Jan 18 | C. Ikonomidis Christopher Ikonomidis |  LazioLAZ | → | Western Sydney WanderersWSW | Loan |
| 31 Jan 18 | B. Warland Ben Warland | Adelaide UnitedADE | → | Sydney FCSYD | Undisclosed |
| 31 Jan 18 | C. Ikonomidis Christopher Ikonomidis | LazioLAZ | → | Western Sydney WanderersWSW | Loan |
| 28 Jan 18 | M. Milligan Mark Milligan | Melbourne VictoryMVC | → | AAXAl AhliAl Ahli | 1,000,000 |
| 17 Jan 18 | P. Skapetis Peter Skapetis | Brisbane RoarBRR | → | Central Coast MarinersCCM | Free |
| 16 Jan 18 | R. Cornthwaite Robert Cornthwaite | Western Sydney WanderersWSW | → |  PerakPER | Free |
| 11 Jan 18 | M. Carrusca Marcelo Carrusca | Melbourne City FCMCY | → | Western Sydney WanderersWSW | Free |
| 03 Jan 18 | T. Antonis Terry Antonis |  VVV-VenloVVV | → | Melbourne VictoryMVC | Free |
| 03 Jan 18 | T. Antonis Terry Antonis | VVV-VenloVVV | → | Melbourne VictoryMVC | Free |
| 03 Jan 18 | D. Djulbic Dino Djulbic |  KL Felda UnitedFEL | → | Melbourne VictoryMVC | Free |