William Thomas Carroll (June 25, 1902 – October 25, 1992) was an American politician who was the 91st lieutenant governor of Connecticut from 1949 to 1951.
He was Connecticut State Treasurer from 1945, but was defeated for reelection in 1946, thus ending his term in early 1947.
In 1948, he was running mate of gubernatorial candidate Chester Bowles and won, they entered service on January 5, 1949.
They ran for reelection in November 1950, but lost and ended their service on January 3, 1951.
Carroll lost bids for the United States Senate in 1952 and the Governorship in 1954.