| Teams | 8 | ||
|---|---|---|---|
| Champions |  Newcestown (2nd title) | ||
| Runners-up |  Castlemartyr | ||
| |||
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.
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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]