| Club: | Arsenal |
| Season: | 1920–21 |
| Manager: | Leslie Knighton |
| Chairman: | Henry Norris |
| Stadium: | Highbury |
| League: | First Division |
| League Result: | 9th |
| Cup1: | FA Cup |
| Cup1 Result: | 1st Round |
| Pattern So1: | _redtop |
| Leftarm1: | ff0000 |
| Body1: | ff0000 |
| Rightarm1: | ff0000 |
| Socks1: | 000000 |
| Pattern So2: | _redtop |
| Leftarm2: | 000066 |
| Body2: | 000066 |
| Rightarm2: | 000066 |
| Socks2: | 000000 |
| Prevseason: | 1919–20 |
| Nextseason: | 1921–22 |
The 1920–21 season was Arsenal's 2nd consecutive season in the top division of English football after playing in the London Combination league for several years. The team played 42 games, of which it won 15, drew 14, and lost 13. They finished 9th in the league.
Arsenal's score comes first[1]
| Win | Draw | Loss |
See main article: 1920–21 Football League.
| Date | Opponent | Venue | Result | Attendance | Scorers | |
|---|---|---|---|---|---|---|
| 28 August 1920 | Aston Villa | A | 0–5 | |||
| 30 August 1920 | Manchester United | H | 2–0 | |||
| 4 September 1920 | Aston Villa | H | 0–1 | |||
| 6 September 1920 | Manchester United | A | 1-1 | |||
| 11 September 1920 | Manchester City | H | 2–1 | |||
| 18 September 1920 | Manchester City | A | 1–3 | |||
| 25 September 1920 | Middlesbrough | H | 2–2 | |||
| 2 October 1920 | Middlesbrough | A | 1–2 | |||
| 9 October 1920 | Bolton Wanderers | H | 0–0 | |||
| 16 October 1920 | Bolton Wanderers | A | 1–1 | |||
| 23 October 1920 | Derby County | A | 1–1 | |||
| 30 October 1920 | Derby County | H | 2–0 | |||
| 6 November 1920 | Blackburn Rovers | A | 2–2 | |||
| 13 November 1920 | Blackburn Rovers | H | 2–0 | |||
| 20 November 1920 | Huddersfield Town | A | 4–0 | |||
| 27 November 1920 | Huddersfield Town | H | 2–0 | |||
| 4 December 1920 | Chelsea | A | 2–1 | |||
| 11 December 1920 | Chelsea | H | 1–1 | |||
| 18 December 1920 | Bradford City | A | 1–3 | |||
| 25 December 1920 | Everton | A | 4–2 | |||
| 27 December 1920 | Everton | H | 1–1 | |||
| 1 January 1921 | Bradford City | H | 1–2 | |||
| 15 January 1921 | Tottenham Hotspur | A | 1–2 | |||
| 22 January 1921 | Tottenham Hotspur | H | 3–2 | |||
| 29 January 1921 | Sunderland | H | 1–2 | |||
| 5 February 1921 | Sunderland | A | 1–5 | |||
| 12 February 1921 | Oldham Athletic | A | 1–1 | |||
| 19 February 1921 | Oldham Athletic | H | 2–2 | |||
| 26 February 1921 | Preston North End | A | 1–0 | |||
| 12 March 1921 | Burnley | A | 0–1 | |||
| 19 March 1921 | Burnley | H | 1–1 | |||
| 26 March 1921 | Sheffield United | H | 2–6 | |||
| 28 March 1921 | West Bromwich Albion | H | 2–1 | |||
| 29 March 1921 | West Bromwich Albion | A | 4–3 | |||
| 2 April 1921 | Sheffield United | A | 1–1 | |||
| 9 April 1921 | Bradford Park Avenue | H | 2–1 | |||
| 16 April 1921 | Bradford Park Avenue | A | 1–0 | |||
| 23 April 1921 | Newcastle United | H | 1–1 | |||
| 25 April 1921 | Preston North End | H | 2–1 | |||
| 30 April 1921 | Newcastle United | A | 0–1 | |||
| 2 May 1921 | Liverpool | H | 0–0 | |||
| 7 May 1921 | Liverpool | A | 0–3 |
See main article: 1920–21 FA Cup.