Sin-shumu-lishir (or Sin-shum-lishir, Sîn-šumu-līšir), was a usurper king of a part of the Assyrian empire during 626 BC. Little is known about this king due to the lack of sources covering this time.
Sin-shumu-lishir first appears in Assyrian sources as a general of the Assyrian king Ashur-etil-ilani. It seems that he later tried to seize the throne. He is credited with a reign of one year by the Uruk king list, preceding Sin-shar-ishkun.
His first year was attested in texts from the Babylonian cities of Bab-ili, Nippur, and Ru'a. Because there is only evidence about his first year as ruler, it is not likely that his reign lasted much longer. Sin-shumu-lishir never controlled all of the Assyrian empire and most likely only a part of Babylonia.
| King of Assyria