Edward Vaughn Long was a United States Senator from Missouri and a member of the Democratic Party. He served in the United States Senate from 1960 until 1968.
Born in rural Lincoln County, Missouri near Whiteside, he was educated at Culver-Stockton College and the University of Missouri.
After holding various local offices in Bowling Green and Pike County, Long was elected to the Missouri State Senate, where he served from 1945 to 1955; he was elected majority floor leader in 1952 and President pro tempore in 1955.
In his first statewide race, he was elected the Lieutenant Governor of Missouri in 1956, serving from 1957 until his appointment in 1960 by Governor James T. Blair, Jr. to the Senate seat made vacant by the death of Thomas C. Hennings, Jr.. He won election to the Senate in his own right in 1962, but lost a primary challenge to Thomas F. Eagleton in 1968, and resigned his seat on December 27 of that year, resuming his law practice in Missouri.
Long is buried in Grand View Burial Park, Hannibal, Missouri.