| Club: | Aberdeen F.C. |
| Season: | 1998–99 |
| Manager: | Alex Miller (to November) Paul Hegarty (caretaker manager, until May) |
| Mgrtitle: | Manager |
| Chairman: | Stewart Milne |
| Chrtitle: | Chairman |
| League: | Scottish Premier League |
| League Result: | 8th |
| Cup1: | Scottish Cup |
| Cup1 Result: | 3rd Round |
| Cup2: | Scottish League Cup |
| Cup2 Result: | 4th Round |
| League Topscorer: | Eoin Jess (14) |
| Season Topscorer: | Eoin Jess (14) |
| Highest Attendance: | 22,000 vs. Manchester United, Teddy Scott Testimonal, 18 January 1999 19,537 vs. Rangers, 30 January 1999 |
| Lowest Attendance: | 9,048 vs. Kilmarnock, 10 April 1999 |
| Average Attendance: | 11,959 |
| Prevseason: | 1997–98 |
| Nextseason: | 1999–2000 |
Aberdeen F.C. competed in the inaugural Scottish Premier League, Scottish League Cup and Scottish Cup in season 1998–99.
See main article: 1998–99 Scottish Premier League.
| Match Day | Date | Opponent | H/A | Score | Aberdeen Scorer(s) | Attendance |
|---|---|---|---|---|---|---|
| 1 | 1 August | Dundee | A | 2–0 | Jess, Hignett | 7,811 |
| 2 | 16 August | Celtic | H | 3–2 | Perry, Hignett, Blinker | 16,640 |
| 3 | 22 August | Heart of Midlothian | A | 0–2 | 14,952 | |
| 4 | 29 August | Dunfermline Athletic | A | 1–1 | Perry | 6,463 |
| 5 | 12 September | Motherwell | H | 1–1 | Jess | 11,760 |
| 6 | 19 September | St Johnstone | A | 0–2 | 5,814 | |
| 7 | 23 September | Rangers | H | 1–1 | Jess | 17,862 |
| 8 | 27 September | Kilmarnock | H | 0–1 | 13,048 | |
| 9 | 4 October | Dundee United | A | 0–1 | 8,933 | |
| 10 | 17 October | Dundee | H | 2–2 | Jess (2) | 10,004 |
| 11 | 24 October | Celtic | A | 0–2 | 60,081 | |
| 12 | 31 October | Motherwell | A | 2–2 | Newell, Winters | 8,146 |
| 13 | 7 November | Dunfermline Athletic | H | 2–1 | Jess (2) | 10,293 |
| 14 | 14 November | Rangers | A | 1–2 | Jess | 49,479 |
| 15 | 21 November | St Johnstone | H | 0–1 | 10,044 | |
| 16 | 28 November | Dundee United | H | 0–3 | 11,964 | |
| 17 | 5 December | Kilmarnock | A | 0–4 | 9,785 | |
| 18 | 12 December | Heart of Midlothian | H | 2–0 | Winters, Jess | 11,137 |
| 19 | 19 December | Dundee | A | 2–1 | Winters (2) | 6,340 |
| 20 | 26 December | Dunfermline Athletic | A | 2–1 | Inglis, Jess | 7,873 |
| 21 | 29 December | Motherwell | H | 1–1 | Jess | 15,269 |
| 22 | 2 January | St Johnstone | A | 1–4 | Buchan | 8,971 |
| 23 | 30 January | Rangers | H | 2–4 | Newell, Jess | 19,537 |
| 24 | 6 February | Kilmarnock | H | 2–1 | Jess, Mayer | 9,299 |
| 25 | 20 February | Dundee United | A | 0–3 | 8,309 | |
| 26 | 27 February | Heart of Midlothian | A | 2–0 | Wyness, Bernard | 13,957 |
| 27 | 14 March | Celtic | H | 1–5 | Winters | 16,825 |
| 28 | 20 March | Motherwell | A | 1–1 | Winters | 6,963 |
| 29 | 3 April | Dunfermline Athletic | H | 3–1 | Winters (3) | 11,371 |
| 30 | 10 April | Kilmarnock | A | 2–4 | Winters, Hamilton | 9,048 |
| 31 | 17 April | Dundee United | H | 0–4 | 11,603 | |
| 32 | 25 April | Rangers | A | 1–3 | Perry | 49,145 |
| 33 | 1 May | St Johnstone | H | 1–0 | Winters | 9,561 |
| 34 | 8 May | Dundee | H | 1–2 | Winters | 9,057 |
| 35 | 15 May | Celtic | A | 2–3 | 59,138 | |
| 36 | 23 May | Heart of Midlothian | H | 2–5 | Buchan, Jess | 13,042 |
See main article: 1998–99 Scottish League Cup.
| Round | Date | Opponent | H/A | Score | Aberdeen Scorer(s) | Attendance |
|---|---|---|---|---|---|---|
| R2 | 8 August | Inverness Caledonian Thistle | A | 3–0 | Dodds (3) | 5,164 |
| R3 | 19 August | Hibernian | A | 0–1 | 7,457 | |
See main article: 1998–99 Scottish Cup.