| Tournament details | |
|---|---|
| County | Down |
| Province | Ulster |
| Year | 2020 |
| Trophy | Frank O'Hare Cup |
| Sponsor | Morgan Fuels |
| Teams | 16 |
| Defending champions | Kilcoo |
| Winners | |
| Champions | Kilcoo (18th title) |
| Qualify for | None (due to COVID-19 Pandemic) |
The 2020 Down Senior Football Championship was the 112th official edition of Down GAA's premier Gaelic Football tournament for senior clubs in County Down, with 16 teams competing. The tournament operated a double elimination format for the opening two rounds of the championship, with the winners and early round losers rejoining at the quarter final stage.
Kilcoo were the holders after defeating Warrenpoint in the 2019 final.
Due to the impact of the COVID-19 pandemic on Gaelic games, relegation from the S.F.C. was not tied to this year's Down Football League. Instead, a Relegation Play-off was implemented within this year's S.F.C. format. Darragh Cross were relegated to the 2021 I.F.C. after losing their Relegation Play-Off. Saul will replace them after they claimed the 2020 I.F.C. title.