Larsa
| Location | Tell as-Senkereh, Dhi Qar Governorate, Iraq | 
|---|---|
| Region | Mesopotamia | 
| Coordinates | 31°17′9″N 45°51′13″E / 31.28583°N 45.85361°E | 
| Type | Settlement | 
Larsa (Sumerian: 𒌓𒀕𒆠, romanized: UD.UNUGKI, read Larsamki), also referred to as Larancha/Laranchon (Gk. Λαραγχων) by Berossos and connected with the biblical Ellasar, was an important city-state of ancient Sumer, the center of the cult of the sun god Utu with his temple E-babbar. It lies some 25 km (16 mi) southeast of Uruk in Iraq's Dhi Qar Governorate, near the east bank of the Shatt-en-Nil canal at the site of the modern settlement Tell as-Senkereh or Sankarah.
Larsa is thought to be the source of a number of tablets involving Babylonian mathematics, including the Plimpton 322 tablet that contains patterns of Pythagorean triples.