The GAA Football All-Ireland Under-20 B Championship is an annual inter-county Gaelic football competition organised by the Gaelic Athletic Association (GAA).

It is the second tier inter-county Gaelic football competition for male players between the ages of 17 and 20 in Ireland.

The final serves as the culmination of a series of games played during the spring months, and the results determine which team receives the cup.

The All-Ireland Under-20 Football Championship was created in 1964 in response to a Congress motion put forward by the Kerry County Board.

During the course of a championship season three games are played comprising two semi-finals and a final.