The following is a summary of Donegal county football team's 2021 season.
Paul Fisher departed as strength and conditioning coach and Antoin McFadden replaced him.
[3] James Gallagher returned as goalkeeping coach (his second time in that role),[1][4] replacing Andrew McGovern.
[5] There was no McKenna Cup in 2021 due to the impact of the COVID-19 pandemic on Gaelic games.
[9][10] Due to the impact of the COVID-19 pandemic on Gaelic games, there was no back-door route into the All-Ireland Championship.