2021 Ulster Senior Club Football Championship
The 2021 Ulster Senior Club Football Championship was the 53rd instalment of the annual competition organised by Ulster GAA. It is one of the four provincial competitions of the 2021–22 All-Ireland Senior Club Football Championship.
The Ulster club championship returned this year after not being held in 2020 due to the COVID-19 pandemic. Kilcoo from Down were the reigning Ulster champions following their victory in the 2019 final over Donegal's Naomh Conaill.
Kilcoo claimed their second Ulster title after a comfortable win against Fermanagh's Derrygonnelly Harps, who were appearing in their first Ulster final.
Teams
The Ulster championship is contested by the winners of the nine county championships in the Irish province of Ulster. Ulster comprises the six counties of Northern Ireland, as well as Cavan, Donegal and Monaghan in the Republic of Ireland.| County | Team | Last win |
| Antrim | Kickhams Creggan | |
| Armagh | Clann Éireann | |
| Cavan | Ramor United | |
| Derry | Watty Graham's, Glen | |
| Donegal | St Eunan's | |
| Down | Kilcoo | 2019 |
| Fermanagh | Derrygonnelly Harps | |
| Monaghan | Scotstown | 1989 |
| Tyrone | Dromore St Dympna's |
Preliminary round
----Quarter-finals
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Semi-finals
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Final
----Championship statistics
Top scorers
;Overall| Rank | Player | Club | Tally | Total | Matches | Average |
| 1 | Danny Tallon | Glen | 1-12 | 15 | 3 | 5.00 |
| 1 | Conall Jones | Derrygonnelly Harps | 1-12 | 15 | 3 | 5.00 |
| 3 | Paul Devlin | Kilcoo | 0-11 | 11 | 3 | 3.67 |
| 3 | Jerome Johnston | Kilcoo | 3-2 | 11 | 3 | 3.67 |
| 5 | Ceilum Doherty | Kilcoo | 2-4 | 10 | 3 | 3.33 |
| 5 | Conor Turbitt | Clann Éireann | 0-10 | 10 | 2 | 5.00 |
| 7 | Shane McGullion | Derrygonnelly Harps | 2-1 | 7 | 3 | 2.33 |
| 7 | Sean McEvoy | Ramor United | 1-4 | 7 | 1 | 7.00 |
| 7 | Daniel Magee | Errigal Ciarán | 1-4 | 7 | 2 | 3.50 |
| 10 | Gary McKenna | Derrygonnelly Harps | 0-6 | 6 | 3 | 2.00 |
;In a single game
| Rank | Player | Club | Tally | Total | Opposition |
| 1 | Jerome Johnston | Kilcoo | 2-2 | 8 | Ramor United |
| 1 | Conall Jones | Derrygonnelly Harps | 1-5 | 8 | Clann Éireann |
| 3 | Sean McEvoy | Ramor United | 1-4 | 7 | Kilcoo |
| 4 | Shane McGullion | Derrygonnelly Harps | 2-0 | 6 | Clann Éireann |
| 4 | Daniel Magee | Clann Éireann | 1-3 | 6 | Kickhams Creggan |
| 4 | Ceilum Doherty | Kilcoo | 1-3 | 6 | Ramor United |
| 4 | Danny Tallon | Glen | 1-3 | 6 | Scotstown |
| 4 | Conall Jones | Derrygonnelly Harps | 0-6 | 6 | Dromore |
| 4 | Conor Turbitt | Clann Éireann | 0-6 | 6 | Derrygonnelly Harps |
| 10 | Ruairi McDonald | Clann Éireann | 1-2 | 5 | Kickhams Creggan |
| 10 | Danny Tallon | Glen | 0-5 | 5 | St Eunan's |
| 10 | Paul Devlin | Kilcoo | 0-5 | 5 | Derrygonnelly Harps |