All-Ireland Senior B Football Championship

The All-Ireland Senior B Football Championship was a second tier Gaelic football championship competition held 1990 and 2000 and organised by the Gaelic Athletic Association (GAA). It is contested by those county teams who were defeated in the early rounds of their provincial championships in the All-Ireland Senior Football Championship and the winner is awarded the championship.

The championship was first contested in 1990 when Leitrim became the inaugural winners.

Designed to improve the standard of football in the so-called "weaker" counties, the competition was played for the last time in 2000, as a result of the introduction of the All-Ireland Qualifiers for the 2001 football championship. The qualifier system gave each defeated county a second chance via the "back-door", after losing in the provincial championships.

Format
The championship was played on a straight knockout basis, typically starting in October each year alongside the National League fixtures, and concluding in November or December.