| Club: | Adelaide United |
| Season: | 2018–19 |
| Manager: | Marco Kurz |
| Chairman: | Piet van der Pol |
| Stadium: | Coopers Stadium, Adelaide |
| League: | A-League |
| League Result: | 4th |
| Cup1: | A-League Finals Series |
| Cup1 Result: | Semi-finals |
| Cup2: | FFA Cup |
| Cup2 Result: | Champions |
| League Topscorer: | Craig Goodwin (10 goals) |
| Season Topscorer: | Craig Goodwin (15 goals) |
| Highest Attendance: | 12,866 vs. Melbourne Victory (19 April 2019) |
| Lowest Attendance: | 7,071 vs. Brisbane Roar (2 February 2019) |
| Average Attendance: | 9,295 |
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| Prevseason: | 2017–18 |
| Nextseason: | 2019–20 |
The 2018–19 Adelaide United FC season was the club's 15th season since its establishment in 2003. The club participated in the A-League for the 14th time and the FFA Cup for the 5th time.
| No. | Position | Player | Transferred from | Type/fee | Contract length | Date | Ref | |
|---|---|---|---|---|---|---|---|---|
| 22 | Melbourne City | Free transfer | 2 years | 14 May 2018 | [1] | |||
| 11 | Free transfer | 3 years | 25 May 2018 | [2] | ||||
| 10 | — | 1 year | 6 July 2018 | [3] | ||||
| 31 |  Eintracht Braunschweig | Free transfer | 2 years | 21 July 2018 | [4] | |||
| 3 | Free transfer | 1 year | 31 July 2018 | [5] | ||||
| 26 | Free transfer | 2 years | 14 August 2018 | [6] | ||||
| 19 |  De Graafschap | Loan | 6 months | 31 January 2019 | [7] |
| No. | Position | Player | Transferred to | Type/fee | Date | Ref | |
|---|---|---|---|---|---|---|---|
| 21 | Western Sydney Wanderers | Free transfer | 9 May 2018 | [8] | |||
| 11 |  SønderjyskE | Free transfer | 23 May 2018 | [9] | |||
| 19 | Heart of Midlothian | Free transfer | 24 May 2018 | [10] | |||
| 12 | End of contract | 25 May 2018 | [11] | ||||
| 24 | End of contract | 25 May 2018 | |||||
| 37 | Mutual contract termination | 25 May 2018 | |||||
| 77 | End of contract | 25 May 2018 | |||||
| 22 | Loan return | 31 May 2018 | [12] | ||||
| 5 | $50,000 (paid by player)[13] | 9 January 2019 | [14] |
| No. | Name | Position | Duration | Date | Notes | |
|---|---|---|---|---|---|---|
| 23 | Centre back | 3 years | 2 May 2018 | [15] | ||
| 6 | Defensive midfielder | 1 year | 4 May 2018 | [16] | ||
| 2 | Right back | 1 year | 14 March 2019 | [17] | ||
| 17 | Winger | 2 years | 5 April 2019 | [18] |
| Position | Staff | |
|---|---|---|
| Head coach | Marco Kurz | |
| Assistant coach | Filip Tapalović | |
| Goalkeeper coach |  Frank Juric | |
| Physiotherapist | Nafyn Pattiaratchi |
|-|colspan="26"|Players no longer at the club† = Scholarship or NPL/NYL-listed player
| Competition | Started Round | Final position / round | First match | Last match | |
|---|---|---|---|---|---|
| A-League | — | 4th | 19 October 2018 | 25 April 2019 | |
| A-League Finals | Elimination-finals | Semi-finals | 5 May 2019 | 10 May 2019 | |
| FFA Cup | Round of 32 | Champions | 1 August 2018 | 30 October 2018 |
See main article: 2018–19 A-League.
See main article: 2018 FFA Cup.