Conflans-Sainte-Honorine ([kɔ̃.flɑ̃.sɛ̃t‿ɔ.nɔ.ʁin]) is a commune in the Yvelines department in the Île-de-France region in north-central France. It is located in the northwestern suburbs of Paris, 24.2 km (15.0 mi) from the center of Paris.

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Conflans-Sainte-Honorine
Commune
The historic center of Conflans-Sainte-Honorine
Coat of arms
Location (in red) within Paris inner and outer suburbs
Location of Conflans-Sainte-Honorine
Conflans-Sainte-Honorine Show map of France Conflans-Sainte-Honorine Show map of Île-de-France (region)
Coordinates: 48°59′57″N 2°05′54″E
Country	France
Region	Île-de-France
Department	Yvelines
Arrondissement	Saint-Germain-en-Laye
Canton	Conflans-Sainte-Honorine
Intercommunality	CU Grand Paris Seine et Oise
Government
• Mayor (2020–2026)	Laurent Brosse[1]
Area 1	9.9 km2 (3.8 sq mi)
Population  (2021)[2]	35,926
• Density	3,600/km2 (9,400/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	78172 /78700
Elevation	17–60 m (56–197 ft) (avg. 25 m or 82 ft)
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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The commune was originally named for its geographic position at the confluence of the Seine and Oise rivers. The village was given the addition "Sainte Honorine" in the 13th century after Saint Honorina, whose relics had been kept there since AD 876.

Partly on account of its strategic position, Conflans-Sainte-Honorine is considered the capital of the French inland waterways, and the right bank of the river Seine is still lined with barges (although these are now used mainly as houseboats). Every year in June, the town celebrates the Pardon national de la batellerie in remembrance of its former importance to inland shipping.

Conflans-Sainte-Honorine is served by Conflans-Sainte-Honorine station on the Transilien Paris-Saint-Lazare regional rail line.

It is also served by Conflans-Fin-d'Oise station which is an interchange station on Paris RER line A and on the Transilien Paris-Saint-Lazare suburban rail line.

As of 2016^[update] the city's schools had 4,258 students. There are nine public preschools, seven public elementary schools, one private school, and an école régionale du premier degré (ERPD).^[5]

Elementary schools:

• École élémentaire Chennevières
• École élémentaire Clos-d’en-Haut
• École élémentaire Côtes-Reverses
• École élémentaire Gaston-Rousset
• École élémentaire Grandes-Terres
• École élémentaire Henri-Dunant
• École élémentaire Paul-Bert

The médiathèque Blaise-Cendrars has digital documents and multimedia services.^[6]

Samuel Paty, a middle school teacher at Collège du Bois d'Aulne in Conflans-Sainte-Honorine, was killed and beheaded in 2020 in an Islamist terrorist attack.

Centre aquatique de Conflans has the town's pool.^[7]

• Charb (1967–2015), satirical caricaturist and journalist, was born in Conflans
• Samuel Coco-Viloin (born 1987), track and field athlete
• Gérard Genette (1930–2018), literary critic and theorist of literature, spent part of his childhood there
• Jean-Paul Huchon, president of the regional council for Île-de-France, Socialist party, former mayor of Conflans (1994–2001)
• Michel Rocard (1930–2016), French prime minister (1988–1991), Socialist party, mayor of Conflans (1977–1994)
• Nicolas Roche (born 1984), Irish professional cyclist, was born here
• Nicolas Szerszen, volleyball player at Ohio State University. AVCA national Player of the Year (2016). NCAA tournament Most Outstanding Player (2017).^{[citation needed]}

Conflans-Sainte-Honorine is twinned with:^[8]

• Großauheim (Hanau), Germany
• Chimay, Belgium
• Ramsgate, England, United Kingdom

• Communes of the Yvelines department
• 2020 Islamist attack