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

Cobadin is situated at an altitude of about 100 m (330 ft), on the banks of the river Urluia (a right tributary of the Danube).

It is crossed by national road DN3, which starts in Bucharest, 222 km (138 mi) to the west, and ends in Constanța, on the Black Sea coast.

As of the 2011 census, the population of the commune was 8,346, out of which 6,480 (77.44%) were Romanians, 1,021 (12.23%) Turks, 442 (5.29%) Tatars, 359 (4.30%) Romani, 7 (0.08%) Aromanians, and 37 others.

At the 2021 census, Cobadin had 9,122 inhabitants; of those, 71.77% were Romanians, 15.86% Turks, 4.05% Tatars, and 1.26% Romani.