1984 United States presidential election in Wyoming

The 1984 United States presidential election in Wyoming 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 three electors to the Electoral College, which selected the president and vice president of the United States.

Wyoming was won by incumbent United States President Ronald Reagan of California, who was running against former Vice President Walter Mondale of Minnesota. 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 election was a very partisan election for Wyoming, with just under 99 percent of the electorate voting for either the Democratic or Republican parties, and only three parties appearing on the ballot. Reagan won every county in Wyoming by a majority, a particularly strong turnout even in this typically conservative leaning state. The Republican turnout was softest in the middle southern part of the state, inclusive and extending west of Laramie, but it is ubiquitous.

Wyoming weighed in for this election as 24 points more Republican than the national average. With 70.51% of the popular vote, the state proved to be Reagan's fourth-strongest state in the election after Utah, Idaho, and Nebraska. Reagan won the election in Wyoming with a 42-point landslide, the strongest-ever performance by any presidential nominee in the state until Donald Trump in 2024. This election was the only time that a Republican won consecutive presidential elections by carrying all of Wyoming's counties in both instances.