16 teams competed, with the winner representing Donegal in the Ulster Senior Club Football Championship.
Naomh Conaill was defending champion after defeating Gaoth Dobhair by a scoreline of 0–8 to 0–7, after a second replay in the 2019 final.
[2] The 2020 competition progressed as far as the final but this match was twice postponed due to issues arising from the impact of the COVID-19 pandemic on Gaelic games.
This was St Naul's return to the senior grade (for the first time since 2012), after a seven-year exodus concluded with the club winning the 2019 Donegal Intermediate Football Championship.
However, it emerged on 21 September that a Cill Chartha player had tested positive for the coronavirus; initially the game was announced to be proceeding as scheduled.
[46][47] However, the GAA suspended all club fixtures with immediate effect on 5 October, citing "post-match celebrations and a lack of social distancing at certain events" elsewhere in the country (i.e. Cork, Meath) as "disappointing and problematic".
[48] Naomh Conaill retained the title, in the most controversial of circumstances, a 4–2 penalty shootout victory after extra-time on Saturday, 14 August 2021.
No Ulster Senior Club Football Championship was held, due to the impact of the COVID-19 pandemic on Gaelic games.