Saint-Ouen-sur-Seine (French pronunciation: [sɛ̃t‿wɛ̃ syʁ sɛn] ; literally "St. Audoin on Seine") is a commune in the northern suburbs of Paris, France, located 6.6 kilometres (4.1 miles) from the centre of Paris. It is part of the Seine-Saint-Denis department, in the Île-de-France region, and of the Métropole du Grand Paris. The commune was called Saint-Ouen until 2018, when it obtained a change of name by ministerial order.

The communes neighbouring Saint-Ouen-sur-Seine are Paris, to the south, Clichy, to the west, Villeneuve-la-Garenne, Gennevilliers and L'Île-Saint-Denis, to the north, and Saint-Denis to the east. The commune of Saint-Ouen-sur-Seine is part of the canton of Saint-Ouen-sur-Seine, which also includes L'Île-Saint-Denis and part of Épinay-sur-Seine. Saint-Ouen also includes the Cimetière de Saint-Ouen.

The town was named after Saint Audoin, a famous 7th century AD Frankish bishop. On 1 January 1860, the city of Paris was enlarged by annexing neighbouring communes. On that occasion, a part of the commune of Saint-Ouen was annexed to the city of Paris. At the same time, the commune of La Chapelle-Saint-Denis was disbanded and divided between the city of Paris, Saint-Ouen, Saint-Denis, and Aubervilliers. Saint-Ouen received a small part of the territory of La Chapelle-Saint-Denis. The commune of Montmartre was also disbanded; the city of Paris annexed most of Montmartre, but Saint-Ouen did receive a small northern part of the territory of that commune.

Historical population

Year Pop. ±% p.a. 1793 845 —     1800 602 −4.73% 1806 649 +1.26% 1821 612 −0.39% 1831 981 +4.83% 1836 983 +0.04% 1841 1,196 +4.00% 1846 1,316 +1.93% 1851 1,507 +2.75% 1856 2,262 +8.46% 1861 3,294 +7.81% 1866 5,804 +12.00% 1872 8,091 +5.69% 1876 11,255 +8.60% 1881 17,718 +9.50% 1886 21,404 +3.85% 1891 25,969 +3.94% 1896 30,715 +3.41%	Year Pop. ±% p.a. 1901 35,436 +2.90% 1906 37,866 +1.34% 1911 41,904 +2.05% 1921 50,848 +1.95% 1926 52,467 +0.63% 1931 53,146 +0.26% 1936 51,106 −0.78% 1946 45,465 −1.16% 1954 48,112 +0.71% 1962 51,956 +0.97% 1968 48,886 −1.01% 1975 43,588 −1.63% 1982 43,606 +0.01% 1990 42,343 −0.37% 1999 39,722 −0.71% 2007 43,954 +1.27% 2012 47,499 +1.56% 2017 51,108 +1.48%
Graphs are unavailable due to technical issues. There is more info on Phabricator and on MediaWiki.org.
Source: EHESS and INSEE (1968-2017)

Saint-Ouen-sur-Seine is home to Paris' flea market, the highest concentration of antique dealers and second-hand furniture dealers in the world. The flea market (marché aux puces) is held every Saturday, Sunday, and Monday; because of this high frequency, compared to other flea markets, it has tended to consist only of professionals who rent their spot for a minimum term of three years. In 2014 the flea market site was acquired by Jean-Cyrille Boutmy from Gerald Grosvenor, 6th Duke of Westminster.

Saint-Ouen-sur-Seine is served by three stations of the Paris Metro: Garibaldi (line 13), Saint-Ouen (line 14 and RER line C) and Mairie de Saint-Ouen (lines 13 and 14).

Saint-Ouen-sur-Seine has:

• 3 school groups of preschools and primary schools
• 9 pre-schools
• 8 primary schools
• 3 "collèges" (lower secondary schools)
  • Collège Jean Jaurès
  • Collège Joséphine Baker
  • Collège Jules Michelet
• 2 high schools/Sixth-form colleges
  • Lycée Marcel Cachin
  • Lycée Auguste Blanqui

Supméca, an accredited mechanical engineering school is located in the Vieux Saint Ouen quarter. It was created in 1948, is member of the university of Paris-Seine and now part of the ISAE Group, which has a total of 6000 students. One literary and humanities Classe préparatoire aux grandes écoles is offered on the Lycée Blanqui high school's premises. The business school Audencia opened a campus in Saint-Ouen in 2023.

• Jacques Gondouin (1737–1818), architect
• Alphonse Halimi (1932–2006), boxer
• Louis Stettner (1922–2016), American photographer of "everyday poetry"
• Karim Bouamrane (b. 1973), politician
• Dany Bill (b. 1973), seven-times Muaythai world champion.
• Benjamin Cuq (b. 1974), journalist-writer
• Abdoulaye Soumare (b. 1980), footballer
• Djimi Traore (b. 1980), footballer
• Richard Clayderman (b. 1953), pianist
• Tchavolo Schmitt (b. 1954), manouche swing guitarist (Porte de Montreuil and Chope des Puces)
• Éric Angelvy (b. 1968), racing driver
• Nosfell (b. 1977), musician

The Stade de Paris (also called the Stade Bauer) is located in the town.

Saint-Ouen is twinned with:

• Terni, Italy
• Salford, England, United Kingdom
• Ruse, Bulgaria
• Podolsk, Russia

• Church of Saint-Ouen-le-Vieux, Roman Catholic
• Cimetière de Saint-Ouen, Saint-Ouen cemetery
• Communes of the Seine-Saint-Denis department

• Website about Saint-Ouen's Marché aux Puces
• Website about Saint-Ouen's Interests