Nam Sách is a rural district of Hải Dương province in the Red River Delta region of Vietnam.

[1] The district covers an area of 133 km2.

The district capital lies at Nam Sách.

[1] The area Nam Sách (南策) is the source of many pottery artifacts.

[2] In 1592, when what is today Hải Dương province was under Mạc dynasty control, Nam Sách along with Kim Thành, Thanh Hà, and Kinh Môn districts were the target of attack by 300 fighting boats of the Lê dynasty.