Bầu cử tổng thống Hoa Kỳ tại Iowa năm 1984

The 1984 United States presidential election in Iowa took place on November 6, 1984. All 50 states and the District of Columbia, were part of the 1984 United States presidential election. Voters chose eight electors to the Electoral College, which selected the president and vice president of the United States. Iowa was won by incumbent United States President Ronald Reagan of California, who was running against former Vice President Walter Mondale of Minnesota. While the majority of counties turned out for Reagan, the politically volatile state of Iowa was a relatively narrow victory for him, thanks in part to the Midwest Farm Crisis of the early 1980s. The relatively weak Republican trend for this election is highlighted by the loss of Des Moines's highly populated Polk County to Mondale.

Iowa weighed in for this election as 11 points more Democratic than the national average. As of the 2024 presidential election, this is the last election in which Black Hawk County (Waterloo), Linn County (Cedar Rapids), and Story County (Ames) voted for a Republican presidential candidate. Iowa would not vote Republican again until 2004.