| Championship details | |
|---|---|
| Dates | 25 May – 5 August 2018 |
| Teams | 31 |
| All-Ireland Champions | |
| Winning team | Kildare (2nd win) |
| Captain | Aaron Masterson |
| Manager | Davy Burke |
| All-Ireland Finalists | |
| Losing team | Mayo |
| Captain | Ryan O'Donoghue |
| Manager | Mike Solan |
| Provincial Champions | |
| Munster | Kerry |
| Leinster | Kildare |
| Ulster | Derry |
| Connacht | Mayo |
| Championship statistics | |
| Player of the Year |  Jimmy Hyland |
| 2019 → | |
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.