Thomas A. "Tom" Loftus (born April 24, 1945) is a retired American diplomat and politician from Wisconsin. A member of the Democratic Party, he was United States Ambassador to Norway from 1993 through 1998, during the presidency of Bill Clinton. Prior to his diplomatic service, he was the 70th Speaker of the Wisconsin State Assembly (1983–1991) at the culmination of a 14-year career in the Wisconsin Legislature, and was the Democratic nominee for Governor of Wisconsin in the 1990 election.