Ad Damazin (Arabic:الدمازين‎ Ad Damazīn) is the capital of Blue Nile State in Sudan. It is the location of the Roseires Dam and power generation plant.

Ad Damazin is served by a terminal station of a branch line of the national railway network. However, the train service to Ad Damazin has been discontinued many years ago. Instead the town can be reached from Khartoum via a decent tarmac road and by plane. However, Ad Damazin Airport is mainly served by UNMIS or government flights.