The 1916 United States presidential election in Arizona took place on November 7, 1916, as part of the 1916 United States presidential election. State voters chose three representatives, or electors, to the Electoral College, who voted for president and vice president.

Pima County is a county in the south central region of the U.S. state of Arizona. As of the 2020 census, the population was 1,043,433, making it Arizona's second-most populous county. The county seat is Tucson, where most of the population is centered. The county is named after the Pima Native Americans, also known as Tohono O'odham, who are indigenous to this area.