Castelu is a commune in Constanța County, Northern Dobruja, Romania.

The commune includes two villages: Castelu is located in the central part of the county, along the Danube–Black Sea Canal.

At the 2011 census, Castelu had 3,453 Romanians (77.08%), 340 Roma (7.59%), 509 Turks (11.36%), 165 Tatars (3.68%), 6 Aromanians (0.13%), 7 others (0.16%).

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