1990 Cork Senior Football Championship
The 1990 Cork Senior Football Championship was the 102nd staging of the Cork Senior Football Championship since its establishment by the Cork County Board in 1887. The draw for the opening round fixtures took place on 17 December 1989. The championship began on 20 April 1990 and ended on 4 November 1990.
Castlehaven entered the championship as the defending champions, however, they were defeated by Muskerry in the second round.
On 4 November 1990, Duhallow won the championship following an 0-08 to 0-06 defeat of St. Finbarr's in the final. This was their second championship title overall and their first title since 1936.
Colm O'Neill and Dave Barry were the championship's joint top scorers with 0-21.Team changes
To Championship
Promoted from the Cork Intermediate Football Championship
First round
Second round
Quarter-finals
Semi-finals
Final
Championship statistics
Top scorers
;Top scorers overall
| Rank | Player | Club | Tally | Total | Matches | Average |
| 1 | Colm O'Neill | Imokilly | 0-21 | 21 | 3 | 7.00 |
| 1 | Dave Barry | St. Finbarr's | 0-21 | 21 | 5 | 4.20 |
| 2 | Tony Power | St. Finbarr's | 3-07 | 16 | 5 | 3.20 |
| 2 | Mick McCarthy | O'Donovan Rossa | 2-10 | 16 | 2 | 8.00 |
| 3 | John Caulfield | Carbery | 1-10 | 13 | 4 | 3.25 |
| 3 | Niall O'Connor | Duhallow | 0-13 | 13 | 4 | 3.25 |
| 4 | Dinny Allen | Nemo Rangers | 2-04 | 10 | 4 | 2.50 |
| 4 | Denis O'Sullivan | Nemo Rangers | 0-10 | 10 | 4 | 2.50 |
| 5 | Ciarán O'Sullivan | Beara | 1-06 | 9 | 2 | 4.50 |
| 5 | William O'Riordan | Kilshannig | 1-06 | 9 | 2 | 4.50 |
| 5 | Stephen Calnan | Nemo Rangers | 0-09 | 9 | 4 | 2.25 |
;Top scorers in a single game
| Rank | Player | Club | Tally | Total | Opposition |
| 1 | Mick McCarthy | O'Donovan Rossa | 1-06 | 9 | Glanmire |
| 1 | Colm O'Neill | Imokilly | 0-09 | 9 | Na Piarsaigh |
| 2 | Tony Power | St. Finbarr's | 2-02 | 8 | St. Nicholas' |
| 2 | Ciarán O'Sullivan | Beara | 1-05 | 8 | Seandún |
| 2 | Dave Barry | St. Finbarr's | 0-08 | 8 | St. Nicholas' |
| 3 | William O'Riordan | Kilshannig | 1-04 | 7 | Na Piarsaigh |
| 3 | John Cleary | Castlehaven | 1-04 | 7 | Muskerry |
| 3 | John Caulfield | Carbery | 1-04 | 7 | St. Finbarr's |
| 3 | Mick McCarthy | O'Donovan Rossa | 1-04 | 7 | Duhallow |
| 3 | Colm O'Neill | Imokilly | 0-07 | 7 | Nemo Rangers |
| 3 | Niall O'Connor | Duhallow | 0-07 | 7 | Carrigdhoun |
Miscellaneous
