Sayf ibn dhī-Yazan (Arabic سيف بن ذي يزن) was a Yemeni Himyarite king who lived between 516 and 574 CE, known for ending Aksumite rule over Southern Arabia. al-Kalbi states that he was the son of dhī-Yazan, the son of 'Āfir, the son of Aslam bin Zayd.
Sayf entered Arab folklore by means of his widely known "biography" Sirat Sayf ibn dhī-Yazan, where much fruit of imagination, including claiming his mother to be a jinni, has been blended with historical facts.