Osny (French pronunciation: [oni] ^ⓘ) is a commune in the Val-d'Oise department, in the northwestern suburbs of Paris, France. It is located 31.6 km (19.6 mi) from the center of Paris, in the "new town" of Cergy-Pontoise, created in the 1960s.

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Osny
Commune
The front of the Château d'Osny
Coat of arms
Location of Osny
Osny Show map of France Osny Show map of Île-de-France (region)
Coordinates: 49°03′36″N 2°03′48″E
Country	France
Region	Île-de-France
Department	Val-d'Oise
Arrondissement	Pontoise
Canton	Cergy-1
Intercommunality	Cergy-Pontoise
Government
• Mayor (2020–2026)	Jean-Michel Levesque[1]
Area 1	12.52 km2 (4.83 sq mi)
Population  (2021)[2]	17,277
• Density	1,400/km2 (3,600/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	95476 /95520
Elevation	27–102 m (89–335 ft)
Website	www.osny.fr
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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Osny is served by Osny station on the Transilien Paris-Saint-Lazare suburban rail line.

Schools include:^[4]

• Six public preschools (maternelles): Charcot, Lameth, La Ravinière, Les Vignes, Paul Roth, Yves Le Guern
• Six public elementary schools: d'Immarmont, La Ravinière, Lameth, Paul Roth, Saint-Exupéry, and Yves Le Guern
• Two private preschools and primary schools: École élémentaire Les Petits Pas and École maternelle et primaire du Petit Prince (Protestant school)
• One public junior high school (collège): la Bruyère
  • Collège Nicolas-Flamel is in nearby Pontoise; some Osny students go there since not everyone may be assigned to the junior high in Osny.
• One private junior high school: Collège Saint-Stanislas
• Two public senior high schools: Lycée Polyvalent Paul-Émile Victor and L’Institut de formation par alternance (IFA) Adolphe Chauvin
• One private senior high school: Lycée professionnel des industries graphiques « Notre famille »

• Communes of the Val-d'Oise department