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.

The 2020 United States presidential election was the 59th quadrennial presidential election, held on Tuesday, November 3, 2020. The Democratic ticket of former vice president Joe Biden and the junior U.S. senator from California Kamala Harris defeated the incumbent Republican president, Donald Trump, and vice president, Mike Pence. The election took place against the backdrop of the global COVID-19 pandemic and related recession. The election saw the highest voter turnout by percentage since 1900, with each of the two main tickets receiving more than 74 million votes, surpassing Barack Obama's record of 69.5 million votes from 2008. Biden received more than 81 million votes, the most votes ever cast for a candidate in a U.S. presidential election.