The 2021 Maricopa County presidential ballot audit, commonly referred to as the Arizona audit, was an examination of ballots cast in Maricopa County during the 2020 United States presidential election in Arizona initiated by Republicans in the Arizona State Senate and executed by private firms. Begun in April 2021, the audit stirred controversy due to extensive previous efforts by Trump and his allies to overturn the election and due to assertions of rule violations and irregularities in the conduct of the recount, leading to claims that the audit was essentially a disinformation campaign. In June 2021, Maggie Haberman of The New York Times and Charles Cooke of National Review reported Trump had told associates that based on the results of the audit, he would be reinstated as president in August 2021.

The 2020 United States presidential election in Arizona was held on Tuesday, November 3, 2020, as part of the 2020 United States presidential election, in which all 50 states and the District of Columbia participated. Arizona voters chose 11 electors to represent them in the Electoral College via a popular vote pitting incumbent Republican President Donald Trump of Florida and his running mate, incumbent Vice President Mike Pence of Indiana, against Democratic challenger and former Vice President Joe Biden of Delaware and his running mate, United States Senator Kamala Harris of California. The Libertarian nominees were also on the ballot.