Lake Hammar (, ) is a saline lake in southeastern part of Iraq within the Hammar Marshes.Hammar Marshland information It has an area of 600–1,350 km2. Water level in the lake fluctuates, with maximum depths varying from 1.8 metres (winter) to 3.0 metres (spring). The lake is an important wetland site for birds.BirdLife Factsheet: Haur Al Hammar. The native inhabitants are Marsh Arabs, some of whom occupy villages on artificial, floating islands.

Hammar Lacus, a feature on Titan, the moon of Saturn, is named after Hammar Lake. Gazetteer of Planetary Nomenclature at IAU.

Lake Hammar is featured in the 2024 videogame Indiana Jones and the Great Circle.

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