William Stourton, 12th Baron Stourton (died 1685) was the grandson and successor of William Stourton. He was the son of Edward Stourton and Mary Petre, daughter of the 3rd Baron Petre. He died on August 7, 1685 in Stourton, Wiltshire, England.
Although taking his seat in Parliament in 1673, the Test Act of 1678 meant that he was excluded from the House of Lords after only five years for being Roman Catholic. His successors were also excluded, until the passing of the Catholic Emancipation Act in 1829.
He married Elizabeth Preston (died April 1688), daughter of Sir John Preston, in 1665. The couple had at least six sons, two of whom died as infants.
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