| Teams | 8 | ||
|---|---|---|---|
| Champions | | ||
| Runners-up | | ||
| |||
The 1990 Cork Junior A Football Championship was the 92nd staging of the Cork Junior A Football Championship since its establishment by Cork County Board in 1895.
The final was played on 2 December 1990 at the Ballinhassig Grounds, between Newcestown and Castlemartyr, in what was their first ever meeting in the final. [1] Newcestown won the match by 0–12 to 0–05 to claim their second championship title overall and a first title in 23 years. [2] [3] [4]
| 2 December 1990Final | Newcestown | 0–12 – 0–05 | Castlemartyr | Ballinhassig Grounds |