Elections were held in the U.S. state of Arizona on November 3, 2020, as part of the 2020 General Election. Arizona voters chose 11 electors to represent them in the Electoral College via a popular vote. Three seats on the Arizona Corporation Commission were up for election, as were all nine of Arizona seats in the United States House of Representatives, and one of its seats in the United States Senate. Primary elections were held in August 2020. Paper ballots for voting by mail were sent to all registered voters in the state.

Arizona was represented by 11 electors in the electoral college. Joe Biden won the state with 49.36% of the popular vote, defeating incumbent President Donald Trump by less than 11,000 votes. This was the first time a Democratic presidential candidate won Arizona since Bill Clinton in 1996 and only the second time since Harry Truman in 1948.

A special election was held due to the death of Republican senator and presidential candidate John McCain.

Former U.S. senator Jon Kyl was originally appointed to the seat, but resigned on December 31, 2018. Outgoing U.S. Representative Martha McSally was appointed to fill the seat following Kyl's resignation.

Democrat Mark Kelly defeated McSally, winning 51% of the vote.

All nine of Arizona's seats in the United States House of Representatives were up for election in 2020. Before the election, Republicans held four seats and Democrats five. No districts changed hands, and thus Democrats maintained control.

Three seats on the Arizona Corporation Commission were up for election. Republican Bob Burns was term-limited and therefore ineligible to run for re-election to a third term in office.

Not on the ballot