Madog Crypl (or Madog Crippil), also known as Madog ap Gruffydd Fychan (c. 1275–1304/6) was a descendant of the sovereign Princes of Powys Fadog and Lords of Dinas Bran. He is sometimes described as Madog III of Powys Fadog. However, he was only lord of some of the family lands under the English crown. Madog married Gwenllian, daughter of Ithel Fychan of Halkin and had a son Gruffydd of Rhuddallt, who was married on 8 July 1304 at the age of six to Elizabeth, daughter of John LeStrange of Knockin.