Coenwulf (also spelled Cenwulf and Kenulf) (died 821) was a Mercian nobleman and the King of Mercia from December 796 until his death. He claimed to be a descendant of a Cenwalh, a brother of Penda and Eowa. The sudden death of King Ecgfrith of Mercia was suspicious and certainly benefited Coenwulf but he was never formally accused. Coenwulf proved to be a strong king who quickly restored Mercian in southern England. He was the last of the Mercian overlords or .