London and New York were withdrawn as a result of the public health restrictions imposed due to the COVID-19 pandemic.

Most division three and four teams who did not reach their provincial final were scheduled to compete in the 2021 Tailteann Cup.

The four provincial winners advanced to the All-Ireland semi-finals which were played as single knockout games.

[2] Dublin were the six-time defending champions, and were seeking to claim an unprecedented seventh consecutive title.

Due to the COVID-19 pandemic, the qualifiers and Super 8s (officially the All-Ireland quarter final group stage) were cancelled.

f = free, m = mark, '45 = score direct from a '45, HT = Half time, AET = After extra time London and New York were withdrawn from the 2020 and 2021 Connacht championships due to international travel restrictions imposed due to the COVID-19 pandemic.

Meaning 1st Championship meetings of Mayo hosting London also Roscommon and New York since 2016 will take place in the 2026 season instead according to Rotation.

An open draw was held on 20 April 2021 with the provision that Cavan, Derry, Monaghan and Tyrone cannot be placed in the preliminary round.