Francis Radclyffe, 1st Earl of Derwentwater

{{Short description|English peer}}

{{Use dmy dates|date=April 2022}}

Francis Radclyffe, 1st Earl of Derwentwater (1625 – April 1697),{{Cite web|last=Lundy|first=Darryl|title=thePeerage.com|date=29 August 2009|url=http://www.thepeerage.com/p39453.htm#i394529|accessdate=7 February 2010}} of Dilston Castle was an English peer and member of the House of Lords. His wife was Catherine Fenwick, daughter of Sir William Fenwick and widow of Henry Lawson. They had five sons and four daughters.

He was the eldest son of Sir Edward Radclyffe, 2nd Baronet of Dilston Castle, and his wife Elizabeth Barton. He was created Earl of Derwentwater, Viscount Radclyffe, and Baron Tyndale on 7 March 1688.{{cite book|author1=Nicholas Harris Nicolas|author-link=Nicholas Harris Nicolas|author2=William Courthope|author2-link=William Courthope (officer of arms)|title=The Historic Peerage of England|url=https://books.google.com/books?id=Y-w9AAAAcAAJ&pg=PA154|year=1857|publisher=John Murray|page=154}} He was succeeded by his eldest son Edward Radclyffe, 2nd Earl of Derwentwater, who married Lady Mary Tudor, natural daughter of Charles II.