Thomas James Walsh (June 12, 1859 – March 2, 1933) was a lawyer and Democratic Party politician from Helena, Montana who represented Montana in the United States Senate from 1913 to 1933. He had a national reputation as a liberal, opposing child labor and supporting women's suffrage. He was President-elect Franklin D. Roosevelt's choice for Attorney General when he died of a heart attack on the way to Roosevelt's inauguration in 1933. More mundanely, he was the chairman of the Democratic National Convention in 1924 and in 1932.