Hem (French pronunciation: [ɛm]; Dutch: Ham) is a commune in the Nord department in northern France.

A territory of around 9.65 km2 (3.73 sq mi), Hem at the beginning of the 19th century numbered just 4 876 inhabitants.

It was at first essentially an agricultural centre with the fine plains of Hauts-Champs, Longchamp, Beaumont and Le Civron, but would reach the height of its industrial prosperity in 1900 although there would still be 41 farmers.

In 1975, only 2 200 jobs were on offer to a potential workforce of 7 890 people (almost half of whom were manual workers).

It contains numerous works of modern art, including two walls of stained glass produced by Alfred Manessier.