Sir Henry Slingsby of Scriven, 1st Baronet, 14 January 1602 – 8 June 1658, was an English landowner, politician and soldier who sat in the House of Commons at various times between 1625 and 1642.

[8] Slingsby's vote shows the complexity of motives at this time, particularly in regard to religion; although he opposed removing bishops from the Church of England, he supported their exclusion from the Lords in February 1642, contrary to instructions from the Court.

[9] In late February 1643, Queen Henrietta Maria landed at Bridlington from the Dutch Republic with a large consignment of weapons; Slingsby joined the escort of 5,000 men who accompanied her to the Royalist war-time capital of Oxford, before returning to York.

In his 'Memoirs' he explains his refusal as due to the requirement he swear an oath of loyalty to Parliament and take the Solemn League and Covenant, accepting a Presbyterian-structured Church of England; 'the one makes me renounce my allegiance, the other my religion'.

[16] His estates were confiscated in 1651, despite the efforts of his Parliamentarian nephew Slingsby Bethell, son of his sister Mary, and the regicide Sir John Bourchier to have him exempted.

Despite efforts to have this sentence commuted by his relative Thomas Belasyse, who was Oliver Cromwell's son-in-law, he was executed on Tower Hill on 8 June 1658, along with another conspirator, John Hewett.

[18] Shortly before his death, Slingsby wrote A father's legacy; Sir Henry Slingsbey's instructions to his sonnes, which was later published; his body was returned to his family and buried at St John the Baptist Church, Knaresborough.