Val-d'Oise (French pronunciation: [val dwaz]) is a French department, created in 1968 after the split of the Seine-et-Oise department and located in the Île-de-France region. In local slang, it is known as "quatre-vingt quinze" (i.e. "ninety-five") or "neuf cinq" (i.e. "nine five"). It gets its name from the Oise River, a major tributary of the Seine, which crosses the region after having started in Belgium and flowed through north-eastern France. Paris-Charles de Gaulle Airport, France's main international airport is partially located in Roissy-en-France, a commune of Val d'Oise.

Val-d'Oise was created when the former departments Seine and Seine-et-Oise were broken up into six departments in 1968.

In descending order, the largest communes (over 25,000 population as of the 1999 census) are: Argenteuil, Sarcelles, Cergy, Garges-lès-Gonesse, Franconville, Ermont, Pontoise, Goussainville, Bezons, Villiers-le-Bel, Taverny, and Sannois.

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.