Sir William Strickland, 1st Baronet (c. 1596 – 12 July 1673) was an English Member of Parliament who supported the parliamentary cause during the English Civil War. Sir William Strickland was the eldest son of Walter Strickland of Boynton, in the East Riding of Yorkshire, inheriting his estates, including Boynton Hall, on his death in 1636. He was educated at Queens' College, Cambridge, and proceeded to Gray's Inn though he seems not to have qualified as a barrister. From 1642 to 1646, Strickland was Custos Rotulorum of the East Riding of Yorkshire.