2020 Connacht Senior Football Championship

The 2020 Connacht Senior Football Championship was the 121st instalment of the annual Connacht Senior Football Championship organised by Connacht GAA. It is one of the four provincial competitions of the 2020 All-Ireland Senior Football Championship. The winning team (Mayo) received the J. J. Nestor Cup, named after J. J. Nestor of Quinaltagh, County Galway.

The draw for the Connacht Championship was made on 8 October 2019.

On 17 March, the GAA confirmed that the opening fixture – due to have taken place at Gaelic Park in The Bronx on 3 May – had been postponed due to the impact of the COVID-19 pandemic on Gaelic games.

Due to the COVID-19 pandemic, London, New York and Sligo did not compete in the championship. As a result, Galway advanced to the provincial final without playing a single match for the first time since 1965. Sligo returned for the 2021 championship. London and New York returned for the 2022 championship.

The Connacht semi-final between Galway and Sligo now rescheulded for the 2023 Connacht final. London and New York games rescheduled for 2025 season.

Only 4 teams for the first since 1952.

Teams
The Connacht championship is contested by the five counties in the Irish province of Connacht plus London and New York.

Due to Covid-19 withdrew teams: + = Back in 2021, * = Back in 2022.