The 2018 Inter-County Under 20 Football Championship was the 55th edition of the competition, and the first since the competition was re-graded from Under 21 to Under 20. It was sponsored by Eirgrid, and known as the EirGrid GAA Football U20 All-Ireland Championship for sponsorship purposes. 31 counties played in the tournament (Kilkenny did not participate). The competition began with a preliminary round game in Ulster on 25 May 2018, and ended with the final on 5 August 2018.