Thomas William Lemuel Prowse (August 31, 1888 – November 2, 1973) was a businessman and was the 17th Lieutenant Governor of Prince Edward Island from 1950 to 1958. The son of Lemuel Ezra Prowse and Frances J. Stanley, he was born and educated in Charlottetown, Prince Edward Island. He was proprietor and president of Prowse Brothers Ltd. in Charlottetown. Active in local politics, he was a councillor on Charlottetown City Council for eight years and served as the 26th mayor from 1930 to 1932.