Franklin D. Roosevelt is the first and only President of the United States to be elected to a third term.

Franklin Delano Roosevelt, also known as FDR, was the 32nd president of the United States from 1933 until his death in 1945. He is the longest-serving U.S. president, and the only one to have served more than two terms. His first 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.

Presidential elections were held in the United States on November 5, 1940. The Democratic ticket of incumbent President Franklin D. Roosevelt and secretary of agriculture Henry Wallace defeated the Republican ticket of businessman Wendell Willkie and senator Charles McNary 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.