1984 United States presidential election in Indiana

The 1984 United States presidential election in Indiana took place on November 6, 1984. All 50 states and the District of Columbia, were part of the 1984 United States presidential election. State voters chose 12 electors to the Electoral College, which selected the president and vice president of the United States. President Ronald Reagan of California won the state of Indiana against former Vice President Walter Mondale of Minnesota by a substantial 23.99% margin. Reagan ran for a second time with incumbent Vice President and former C.I.A. Director George H. W. Bush of Texas, and Mondale ran with Representative Geraldine Ferraro of New York, the first major female candidate for the vice presidency.

The presidential election of 1984 was a rather partisan election in Indiana, with less than one percent of the state voting for third-party candidates, and only two third parties appearing on the ballot. In trend with the state's typically conservative-leaning history, Reagan carried every county in Indiana except for Lake County in the northwest corner. Lake County is part of the Chicago metropolitan area and has a substantial African American population in contrast with the rest of Indiana. Perry County in the southern part of the state was the only other county that failed to give Reagan an absolute majority of the vote.

Reagan won Indiana by a margin of 24%. While Indiana had long been the most Republican-leaning state in the Great Lakes region, Reagan's performance in the state was somewhat underwhelming, as Indiana was only 5.8% more Republican than the nation at large. (By comparison, when it voted for Barack Obama in 2008, the state was just over 6% to the right of the nation at large.)

Reagan's victory marked the fifth consecutive time that Republicans had carried the state since the 1964 presidential election. This streak would continue for an additional five presidential elections until Barack Obama's victory in 2008.

Counties that flipped from Democratic to Republican

 * Perry
 * Pike
 * Scott
 * Switzerland