Nam Dinh Football Club, known as Thép Xanh Nam Định for sponsorship reasons and commonly known as Nam Dinh, is a Vietnamese professional football club based in Nam Định that competes in the V.League 1.

Nam Định is a city in the Red River Delta of northern Vietnam. It is the capital of Nam Định Province. The city of Nam Định is 90 km southeast of Vietnam's capital, Hanoi. From August 18–20 of each year, there is a festival held in Nam Định called the Cố Trạch. This celebration honors General Trần Hưng Đạo, a 13th-century national hero who led Vietnamese forces to victory over the invading Mongols.