Qalat Sukkar (Arabic: قلعة سكر, romanized: Qal`at es Sikar, lit.

'Sugar Castle') is a town in the Dhi Qar Governorate, Iraq, located on the Gharraf Canal.

Qalat Sukar is 6 km northeast of the remains of the ancient Sumerian city of Larsa.

[2] James Abbott Sauer and Khair Yassine, believe that because of the name, and the former marshlands in the area,[3] it is likely that Qalat Sukar was originally the site of a sugar mill,[4] constructed after sugarcane was introduced into the area in the ninth century.

During the Iraq War, the Qalat Sukkar Airfield was occupied by the US Marines and called Camp Fenway.