Asfa Wossen Amha Iyasus (አስፋ ወሰን āsfā wossen, āsfā wessen, Amharic pronunciation: [wɔsːən], "Expand the Bounds"; reigned c. 1770 – c. 1808) was a Meridazmach of Shewa, an important noble office of Ethiopia. He was the son of Amha Iyasus; Mordechai Abir notes that he was one of Amha Iyasus' 48 offspring.
According to Donald Levine, Asfa Wossen spent his youth in a monastery in Menz, where he became proficient at the traditional Amharic poetic genre known as qene.
During his reign, Shewan control over the tributary states of Geshe, Antzioka, Efrata, Moret and Marra Biete were strengthened. One step in this process led Asfa Wossen to follow the advice of his father confessor and embrace the doctrine of the Sost Lidet in order to absorb the key state of Marra Biete.
Abir considers Asfa Wossen "more of an administrator than a war leader", noting the Meridazmach's administrative innovations of Shewa. "However, when the need arose, Asfa Wossen proved himself to be as brave and talented a warrior as he was a good administrator." Levine concurs in this assessment: "As a ruler he resembled many of Gondar's monarchs, preferring to spend his time in religious pursuits and the embellishment of his capital (Ankobar) than on the warpath." Once he secured his control over the Christian parts of Shewa, Asfa Wossen campaigned viciously against the Oromo of the plains of Shewa, the Tulama Oromo, the Mogar Oromo, the Abichu who dwelled at the headwaters of the Awash River, and the Oromo tribes living in the mountains of Garra Korfu.