Sir Bulstrode Whitelocke (6 August 1605 – 28 July 1675) was an English lawyer, writer, parliamentarian, and one of the commissioners of the Great Seal during the Interregnum.

He was the eldest son of Sir James Whitelocke and Elizabeth Bulstrode, and was born on 6 August 1605 at George Croke's house in Fleet Street, London.

He was baptized on 19 August 1605 at the nearby church of St Dunstan-in-the-West, where his mother's parents were married in 1571; his notorious uncle Edmund Whitelocke, being one of the godfathers, announced that the child was to be called Bulstrode.

[citation needed] On the outbreak of the English Civil War he took the side of the Parliament, using his influence in the country as Deputy-Lieutenant to prevent the King from raising troops in Buckinghamshire and Oxfordshire.

Later in the autumn of 1653, and perhaps in consequence, Whitelocke was despatched on a mission to Christina, queen of Sweden, to conclude a treaty of alliance and assure the freedom of the Sound.

Retroactively, the diplomatic mission caused him to be considered as the first of the country's Ambassadors to Sweden, though at the time this was not a regular or fixed position.

He had hitherto shown himself not unsympathetic to reform, having supported the Bill introducing the use of English into legal proceedings, having drafted a new treason law, and having set on foot some alterations in Chancery procedure.

He defeated a bill which sought to exclude lawyers from parliament; and to the sweeping and ill-considered changes in the Court of Chancery proposed by Cromwell and the Council he offered an unbending and honourable resistance, being dismissed in consequence, together with his colleague Sir Thomas Widdrington, on 6 June 1654 from his Commissionership of the Great Seal (see William Lenthall).

[2] On Richard Cromwell's assumption of the Protectorship, Whitelocke was reappointed a Commissioner of the Great Seal, and had considerable influence during the former's short tenure of power.

Nor had he shown himself unduly ambitious or self-seeking in the pursuit of office, and he had proved himself ready to sacrifice high place to the claims of professional honour and duty.