Oliver St John, 3rd Baron St John of Bletso

Oliver St John, 3rd Baron St John of Bletso (c. 1540–1618) was an English politician who sat in the House of Commons from 1588 until 1596 when he inherited the peerage as Baron St John of Bletso.

St John was a son of Oliver St John, 1st Baron St John of Bletso, and Agnes Fisher. He was High Sheriff of Bedfordshire in 1585. In 1588 he was elected Member of Parliament for Bedfordshire. He was High Sheriff of Bedfordshire again in 1589 and was re-elected MP for Bedfordshire in 1593. He succeeded to the barony on the death of his brother John without male issue on 23 October 1596. He was Lord Lieutenant of Huntingdonshire from April 1597 until his death.

St John married Dorothy Reid, daughter of Sir John Rede or Reid, of Odington, Gloucestershire. They had eight sons and seven daughters:

His eldest son Oliver inherited the Barony and became Earl of Bolingbroke. Of his remaining sons, John and Dudley died young, while the remaining five all became Members of Parliament.

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