Oliver St John, 5th Baron St John of Bletso

Oliver St John, 5th Baron St John of Bletso KB (1603 – 23 October 1642) was an English politician who sat in the House of Commons from 1624 to 1629 and in the House of Lords from 1639. He died fighting in the Parliamentary army in the English Civil War.

St John was the son of Oliver St John, 1st Earl of Bolingbroke and his wife Elizabeth Paulet, daughter of William Paulet. He was baptised on 2 April 1603. St John was admitted a fellow commoner of Queens' College, Cambridge on 3 November 1615, and was presumably the Oliver St John granted a passport to travel to Europe in June 1617. He matriculated at Queens' in 1618 and was awarded an MA in 1620.

In 1623, St John married Arabella Egerton, daughter of John Egerton, 1st Earl of Bridgewater, by whom he had four daughters:

In February 1624, his father arranged his return to Parliament as knight of the shire for Bedfordshire, replacing Oliver's uncle Sir Beauchamp St John. St John's father owned large estates there and dominated the representation of the county; Oliver was returned alongside his father's first cousin, Sir Oliver Luke, who was likewise supported by the family interest. On 27 April, St John certified to the House that there were no recusants holding office in his county, but does not otherwise appear in Parliamentary records. After his father was created Earl of Bolingbroke on 28 December, St John adopted the courtesy title of Lord St John of Bletsoe. Re-elected for Bedfordshire in 1625, he was more active in that Parliament, serving on several legislative committees. He was appointed a justice of the peace for Bedford, Bedfordshire, and Hertfordshire that year.

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