Oise (/wɑːz/ wahz; French: [waz] ⓘ; Picard: Oése) is a department in the north of France.

Inhabitants of the department are called Oisiens (French: [wazjɛ̃]) or Isariens, after the Latin name for the river, Isara.

After the coalition victory at Waterloo, the department was occupied by British troops between June 1815 and November 1818.

In March 2021, local Member of Parliament Olivier Dassault was killed in a plane crash.

[4] Oise is part of the current region of Hauts-de-France and is situated 35 km north of Paris.