Sir Robert Strickland of Sizergh (1 January 1600 – April 1671) was an English landowner and politician who sat in the House of Commons in 1624. He supported the King Charles I during the Wars of the Three Kingdoms.
Strickland was the son of Sir Thomas Strickland. He matriculated from Trinity College, Cambridge at Easter 1615. In 1624, he was elected Member of Parliament for Westmorland in the Happy Parliament.
In 1638, Strickland received a colonel's commission from the Viscount Wentworth, Lord Lieutenant of the county of York, to command 900 militia in the North Riding for Charles I during the Bishops' War. And in 1640, he received the king's commission from Algernon, Earl of Northumberland to regiment, accoutre, and march the same to Newcastle-upon-Tyne. In the English Civil War, he received a third commission to command a troop of horse (cavalry) which he is said to have supported in a great measure at his own expense. At the battle of Edgehill, he himself commanded the horse, and his son Sir Thomas Strickland commanded the regiment of foot.
Strickland lived until after Restoration of the King Charles II: for in the next year after the said restoration, he was constituted by Thomas viscount Fauconberg one of the deputy lieutenants of the North Riding of Yorkshire. He died in 1670 was and was succeed by his elder son Sir Thomas Strickland.
Strickland married Margaret Alford, eldest of the three daughters and coheirs of Sir William Alford of Bylton in Cleveland, Yorkshire and had issue, besides his eldest son Sir Thomas Strickland, another son Walter Strickland.
In the year 1646, there is an indenture between Sir Robert Strickland knight and Margaret his wife, Sir Thomas Strickland knight their son and heir apparent, Thomas Strickland second brother of Sir Robert, and Walter Strickland third brother of Sir Robert, of the one part; and Sir John Mallory and Richard Aldbrough esquire, of the other part; containing covenants of an intended settlement upon the marriage of Sir Thomas, with Jane widow of Sir Christopher Dawney baronet.
- Burke, John (1836). A genealogical and heraldic history of the commoners of Great Britain and Ireland enjoying territorial possessions or high official rank: but uninvested with heritable honours. 1. Colburn. p. 56.