Shamshi-ilu (Šamši-ilu) was an influential court dignitary and commander in chief (turtanu) of the Assyrian army who rose in high prominence.

He was active during the reigns of Assyrian kings Adad-nirari III (810–782 BC), Shalmaneser IV (782–772 BC), Ashur-dan III (771–754 BC) and Ashur-nirari V (754–746 BC). Three times, in 780, 770 and 752 BC, he held the office of limmu officials. He resided at Til Barsip, which is now in northern Syria, and where there are many inscriptions mentioning him.