1990 Cork Junior A Football Championship

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. Newcestown won the match by 0–12 to 0–05 to claim their second championship title overall and a first title in 23 years.