Iyasu I, throne name Adyam Sagad, also known as Iyasu the Great, was Emperor of Ethiopia from 19 July 1682 until his death in 1706, and a member of the Solomonic dynasty.

The emperor of Ethiopia, also known as the Atse, was the hereditary ruler of the Ethiopian Empire, from at least the 13th century until the abolition of the monarchy in 1975. The emperor was the head of state and head of government, with ultimate executive, judicial and legislative power in that country. A National Geographic article from 1965 called imperial Ethiopia "nominally a constitutional monarchy; in fact [it was] a benevolent autocracy".