Oise (French pronunciation: [waz]) is a department in the north of France. It is named after the river Oise.

Oise is one of the original 83 departments created during the French Revolution on March 4, 1790. It was created from part of the province of Île-de-France and Picardy.

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

Oise is part of the current region of Picardie and is situated 35 km north of Paris. It is surrounded by the departments of Somme, Aisne, Seine-et-Marne, Val-d'Oise, Eure, and Seine-Maritime.

Natives of the department are called Isariens.

The major tourist attraction of the department is the Parc Astérix, which opened in 1989. Another very interesting site is Beauvais Cathedral. Also to be seen is the Chateau de Pierrefonds, restored by Viollet-le-Duc.

Oise is twinned with Bedfordshire. One of the villages along the river Oise is Auvers-sur-Oise, famous for having been visited by several impressionist artists. This is where Vincent Van Gogh spent his last 70 days and it is his and his brother Theo's resting place.

Amber Jones is the former leader of the Green Party of Saskatchewan serving in this office from 2008 until 2009. Jones is a graduate of the University of Saskatchewan. She also unsuccessfully ran for the federal Green party in the 2008 federal election in the riding of Saskatoon—Rosetown—Biggar. She placed third out of seven candidates winning 1,228 votes losing to Conservative party nominee, Kelly Block.