The 1940 United States presidential election in Nevada took place on November 5, 1940, as part of the 1940 United States presidential election. State voters chose three representatives, or electors, to the Electoral College, who voted for president and vice president.

Lyon County is a county in the U.S. state of Nevada. As of the 2020 census, the population was 59,235. Lyon County comprises the Fernley, NV Micropolitan Statistical Area which is part of the Reno-Carson City-Fernley, NV Combined Statistical Area.