The 2016 United States presidential election in Arizona was held on Tuesday, November 8, 2016, as part of the 2016 United States presidential elections in which all 50 states plus the District of Columbia participated. Arizona voters chose electors to represent them in the Electoral College via a popular vote, pitting the Republican Party's nominee, businessman Donald Trump, and running mate Indiana Governor Mike Pence against Democratic Party nominee, former Secretary of State Hillary Clinton, and her running mate Virginia Senator Tim Kaine. Arizona has 11 electoral votes in the Electoral College.

The 2012 United States presidential election in Arizona took place on November 6, 2012, as part of the 2012 United States presidential election in which all 50 states plus the District of Columbia participated. State voters chose 11 electors to represent them in the Electoral College via a popular vote pitting incumbent Democratic President Barack Obama and his running mate, Vice President Joe Biden, against Republican challenger and former Massachusetts Governor Mitt Romney and his running mate, Congressman Paul Ryan. Prior to the election, all 17 news organizations considered this a state Romney would win, or otherwise considered as a safe red state. Arizona was won by Romney with a 9.06% margin. This is the most recent presidential election in which Arizona failed to back the national winner, and when the Democratic candidate won a presidential election without winning the state. Obama remains the only president to win two terms in office without carrying Arizona either time since the state's founding in 1912. Arizona is also one of only two states that Obama lost in 2008 or 2012 that his vice president Joe Biden would go on to win in 2020, the other being Georgia. This also remains the most recent election where Arizona voted to the right of Georgia, Iowa, Ohio, and North Carolina.