| 2023 Down Senior Football Championship | |
| County: | Down |
| Province: | Ulster |
| Year: | 2023 |
| Trophy: | Frank O'Hare Cup |
| Sponsor: | Morgan Fuels |
| Num Teams: | 16 |
| Defending Champions: | Kilcoo |
| Winners: | Kilcoo |
| Ordinal: | 21 |
| Qualify For: | 2023 Ulster Club SFC |
| Previous: | 2022 |
| Next: | 2024 |
The 2023 Down Senior Football Championship was the 115th official edition of Down GAA's premier Gaelic football tournament for senior clubs in County Down. 16 teams competed, with the winning team representing Down in the Ulster Senior Club Football Championship. The tournament operates 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 come into the competition as defending Down champions.
The following teams have changed division since the 2022 championship season.
Promoted from 2022 Down I.F.C.
Relegated to 2023 Down I.F.C.
The following teams take part in the 2023 edition of the Down Senior Football Championship.[1]
Bold denotes a team still active in the competition
The 16 participating teams were placed into an open draw. The winning teams advance to Round 2A, while losing sides proceed to Round 2B.
Round 2A features the eight winning teams from Round 1, with an open draw to determine the fixtures. The winning teams progress directly to the quarter-finals, with the losing teams proceeding to Round 3.
Round 2B sees the eight losing teams from Round 1 compete for a place in Round 3. The losing teams from this round will be eliminated from the competition.
The 4 losers of Round 2B play each other in the Relegation Semi-finals. The 2 winners will secure their Senior status for 2024, while the 2 losers will face-off in the Relegation Final.
The winner of the Relegation Final will maintain their Senior status into 2024, while the loser will be relegated to the 2024 Down I.F.C.
Saval relegated to 2024 Down Intermediate Football Championship
Round 3 is a supplementary round for teams to have a second chance at reaching the quarter-finals. This round features teams that have lost once so far in this year's competition, either winning in Round 1 and losing in Round 2A, or losing in Round 1 but winning their Round 2B fixture. The losing teams in this round are eliminated from this year's competition.
This round is seeded, meaning that in each fixture a Round 2A losing team will face a Round 2B winning team.
The quarter-finals see the two brackets rejoin, with the earlier Round 2A winners facing a Round 3 winner for a semi-final spot.
The semi-finals will see the four winning sides face off for a place in this year's final. This round is an open draw from the four quarter-final winners.
The final will be played between the two semi-final winning teams, and will take place at Páirc Esler, Newry.