Amar-Sin (Akkadian: 𒀭𒀫𒀭𒂗𒍪: DAmarDSîn, "calf of Sîn", the "𒀭" being a silent honorific for "Divine"), initially misread as Bur-Sin (c. 2046–2037 BC) middle chronology, was the third ruler of the Ur III Dynasty.

[3] Amar-Sin is otherwise known to have campaigned against Elamite rulers such as Arwilukpi of Marhashi, and the Ur Empire under his reign extended as far as the northern provinces of Lullubi and Hamazi, with their own governors.

[5] The Babylonian Weidner Chronicle records the following: "Amar-Sin ... changed the offerings of large oxen and sheep of the Akitu festival in Esagila.

The administrative documentation from Amar-Sin's reign suggests that in his final years, he was confronted with some internal strife, and it is likely that his brother, Shu-Sin, was behind an effort to ovethrow him.

Also in his seventh year, the king hosted military officials from throughout the empire at a banquet in Ur, where they were required to swear an oath of loyalty.

[8] The provincial governors also see some unusual transitions during this time, including being ousted during the middle of Amar-Sin's reign, only to return to their post after his death.