The 1986 All-Ireland Under-21 Football Championship was the 23rd staging of the All-Ireland Under-21 Football Championship since its establishment by the Gaelic Athletic Association in 1964.
Cork entered the championship as defending champions.
On 14 September 1986, Cork won the championship following a 3-16 to 0-12 defeat of Offaly in the All-Ireland final.
[1] This was their seventh All-Ireland title overall and their third in successive seasons.
Semi-finals Finals