2021 Main
| Pl | W | D | L | Diff | Pts | |||
| 1 | Shamrock Rovers | 36 | 24 | 6 | 6 | 59:28 | 31 | 78 |
| 2 | St. Patricks | 36 | 18 | 8 | 10 | 56:42 | 14 | 62 |
| 3 | Sligo Rovers | 36 | 16 | 9 | 11 | 43:32 | 11 | 57 |
| 4 | Derry City | 36 | 14 | 12 | 10 | 49:42 | 7 | 54 |
| 5 | Bohemians | 36 | 14 | 10 | 12 | 60:46 | 14 | 52 |
| 6 | Dundalk | 36 | 13 | 9 | 14 | 44:46 | -2 | 48 |
| 7 | Drogheda | 36 | 12 | 8 | 16 | 45:43 | 2 | 44 |
| 8 | Finn Harps | 36 | 11 | 11 | 14 | 44:52 | -8 | 44 |
| 9 | Waterford | 36 | 12 | 6 | 18 | 36:56 | -20 | 42 |
| 10 | Longford | 36 | 2 | 9 | 25 | 22:71 | -49 | 15 |
Promotion ~ Champions League (Qualification: )
Promotion ~ Europa Conference League (Qualification: )
Premier Division (Relegation)
Relegation ~ Division 1
2021 Relegation
Quarter-finals
| 1 | Waterford | Bye | |
| 3 | Galway | Bray | 0 : 1, 0 : 0 |
| 4 | UC Dublin | Treaty United | 1 : 2, 3 : 0 |
Semi-finals
| 1 | Waterford | Bye | |
| 2 | Bray | UC Dublin | 0 : 2 |
Final
| 1 | Waterford | UC Dublin | 1 : 2 |
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