| Club: | Oldham Athletic |
| Season: | 1990–91 |
| Manager: | Joe Royle |
| Chairman: | Ian Stott |
| Stadium: | Boundary Park |
| League: | Second Division |
| League Result: | 1st |
| Cup1: | FA Cup |
| Cup1 Result: | Fourth round |
| Cup2: | League Cup |
| Cup2 Result: | Third round |
| League Topscorer: | Ian Marshall (18) |
| Pattern B1: | _collar |
| Leftarm1: | 0000ff |
| Body1: | 0000ff |
| Rightarm1: | 0000ff |
| Shorts1: | 0000ff |
| Pattern So1: | _redstripe |
| Socks1: | 0000ff |
| Pattern B2: | _bluecollar |
| Leftarm2: | FF0000 |
| Body2: | FF0000 |
| Rightarm2: | FF0000 |
| Shorts2: | FF0000 |
| Pattern So2: | _bluestripe2 |
| Socks2: | FF0000 |
| Pattern B3: | _england88home |
| Leftarm3: | FFFFFF |
| Body3: | FFFFFF |
| Rightarm3: | FFFFFF |
| Shorts3: | 0000ff |
| Pattern So3: | _redstripe |
| Socks3: | 0000ff |
| Prevseason: | 1989–90 |
| Nextseason: | 1991–92 |
During the 1990–91 English football season, Oldham Athletic A.F.C. competed in the Football League Second Division. A 1st-placed finish in the final table saw promotion and a place in the Football League First Division for the 1991–92 season.
Oldham enjoyed promotion to the top flight after an absence of 68 years after finishing in 1st place.[1]
Home team's score comes first
| Win | Draw | Loss |
| Date | Opponent | Venue | Result | |
|---|---|---|---|---|
| 25 August 1990 | Wolves | A | 2–3 | |
| 28 August 1990 | Leicester | H | 2–0 | |
| 1 September 1990 | Portsmouth | H | 3–1 | |
| 8 September 1990 | Barnsley | A | 0–1 | |
| 15 September 1990 | Oxford | H | 3–0 | |
| 18 September 1990 | Charlton | H | 1–1 | |
| 22 September 1990 | Middlesbrough | A | 0–1 | |
| 29 September 1990 | West Brom | A | 0–0 | |
| 2 October 1990 | Swindon | H | 3–2 | |
| 6 October 1990 | Blackburn | H | 1–1 | |
| 13 October 1990 | Hull | A | 2–2 | |
| 20 October 1990 | Bristol C | A | 1–2 | |
| 23 October 1990 | Ipswich | H | 2–0 | |
| 27 October 1990 | Notts Co | H | 2–1 | |
| 3 November 1990 | Sheff Weds | A | 2–2 | |
| 10 November 1990 | Watford | H | 4–1 | |
| 17 November 1990 | Port Vale | A | 1–0 | |
| 24 November 1990 | Bristol R | A | 2–0 | |
| 1 December 1990 | Brighton | H | 6–1 | |
| 15 December 1990 | Wolves | H | 4–1 | |
| 21 December 1990 | Plymouth | H | 5–3 | |
| 26 December 1990 | West Ham | A | 2–0 | |
| 29 December 1990 | Millwall | A | 0–0 | |
| 1 January 1991 | Newcastle | H | 1–1 | |
| 12 January 1991 | Portsmouth | A | 1–4 | |
| 19 January 1991 | Barnsley | H | 2–0 | |
| 2 February 1991 | Oxford | A | 5–1 | |
| 16 February 1991 | Port Vale | H | 2–0 | |
| 23 February 1991 | Watford | A | 1–1 | |
| 2 March 1991 | Brighton | A | 1–2 | |
| 9 March 1991 | Bristol R | H | 2–0 | |
| 12 March 1991 | Swindon | A | 2–2 | |
| 16 March 1991 | West Brom | H | 2–1 | |
| 20 March 1991 | Hull | H | 1–2 | |
| 23 March 1991 | Blackburn | A | 2–0 | |
| 29 March 1991 | West Ham | H | 1–1 | |
| 1 April 1991 | Plymouth | A | 1–2 | |
| 6 April 1991 | Millwall | H | 1–1 | |
| 10 April 1991 | Leicester | A | 0–0 | |
| 13 April 1991 | Newcastle | A | 3–2 | |
| 16 April 1991 | Charlton | A | 1–1 | |
| 20 April 1991 | Bristol C | H | 2–1 | |
| 27 April 1991 | Ipswich | A | 1–2 | |
| 4 May 1991 | Notts Co | A | 2–0 | |
| 7 May 1991 | Middlesbrough | H | 2–0 | |
| 11 May 1991 | Sheff Weds | H | 3–2 |
See main article: 1990-91 FA Cup.
| R3 | 5 January 1991 | Brentford | H | 3–1 | |
| R4 | 26 January 1991 | Notts Co | A | 2–0 |
See main article: 1990–91 Football League Cup.
| R2 1st leg | 25 September 1990 | Notts Co | A | 1–0 | |
| R2 2nd leg | 10 October 1990 | Notts Co | H | 5–2 (AET) (won 5–3 on aggregate) | |
| R3 | 31 October 1990 | Leeds | A | 2–0 |