Krzysztof Crell-Spinowski (Latin: Crellius Spinovius,[1] English: Christopher Crell) (Raków, Kielce County 1622 - December 12, 1680) was an Arian theologian, pastor of the church of the Polish Brethren.
During his trips abroad to the Netherlands and England he sought material assistance for exiled Arians.
While his second and third sons followed their father's work as ministers in Lithuania, the firstborn, Christopher Crell Jr, accompanied his widowed father to England in 1668 at the age of 10 with his sister, and was left in the care of a spinster, Miss Alice Stuckey.
Christoph Jr. later studied, like his father, at Leiden, where he graduated in medicine 6 July 1682, with a thesis on bladder stones.
His son and namesake went on to become a licentiate of the Royal College of Physicians in London on 2 April 1683.