Jack Welborn was an American politician who served in the Michigan House of Representatives from 1973 to 1974. In 1974, Welborn resigned from the state House to run for a special election in the Michigan Senate caused by the death of Anthony Stamm. He served in the state Senate from 1974 to 1982. In July 1985, Welborn was elected to the state Senate again in another special election following the death of his brother, Senator Robert Welborn. He served from 1985 to 1994.