The 1940 United States presidential election was the 39th quadrennial presidential election. It was held on Tuesday, November 5, 1940. Incumbent Democratic President Franklin D. Roosevelt defeated Republican businessman Wendell Willkie to be reelected for an unprecedented third term in office. Until 1988, this was the last time in which the incumbent's party won three consecutive presidential elections. It was also the fourth presidential election in which both major party candidates were registered in the same home state; the others have been in 1860, 1904, 1920, 1944, and 2016.

Franklin Delano Roosevelt, commonly known by his initials FDR, was an American statesman and politician who served as the 32nd president of the United States from 1933 until his death in 1945. He was a member of the Democratic Party and is the only U.S. president to have served more than two terms. His initial two terms were centered on combating the Great Depression, while his third and fourth saw him shift his focus to America's involvement in World War II.