|Prefecture building of the Seine-Maritime department, in Rouen|
|• President of the General Council||Didier Marie|
|• Total||6,278 km2 (2,424 sq mi)|
|• Density||200/km2 (510/sq mi)|
|Time zone||CET (UTC+1)|
|• Summer (DST)||CEST (UTC+2)|
|^1 French Land Register data, which exclude estuaries, and lakes, ponds, and glaciers larger than 1 km2|
Seine-Maritime (French pronunciation: [sɛn.ma.ʁi.tim]) is a French department in the Upper Normandy region of northern France. It is situated on the northern coast of France, at the mouth of the Seine, and includes the cities of Rouen and Le Havre. Until 1955 it was named Seine-Inférieure.
- 1790 - Creation of the Seine-Inférieure department
- The department was created from part of the old province of Normandy during the French revolution, on 4 March 1790, through the application of a law of 22 December 1789.
- 1815 - Occupation
- After the victory at Waterloo of the coalition armies, the department was occupied by British forces from June 1815 till November 1818.
- 1843 – Railways and industry
- In Rouen, Elbeuf, and Bolbec, the number of textile factories is increasing. Metallurgy and naval construction as well.
- 1851 - A republican department
- Following the then president, Louis-Napoléon Bonaparte's 1851 Coup d'état, Seine-Inférieure was one of several departments placed under a state of emergency (literally, in French, state of siege)  following fears of significant resistance to the new government.
- World War II
- Occupied by the Wehrmacht, Seine-Maritime is the witness of two Allied military raids in 1942, the Bruneval raid and Dieppe raid.
- 2005 - Inhabitants renamed
- Previously lacking a demonym, the inhabitants of Seine-Maritime (as the department had been renamed in 1955) determined, following a public consultation, that they should be known in official documents as "Seinomarins"  (males) and "Seinomarines" (females).
The arms of the departement Seine-Maritime are blazoned :
The department can be split into three main areas:
- The Seine valley, wflows through the provincial capital Rouen.
- The northern coastline, including the towns of Dieppe and Le Havre.
- The Norman Pays de Bray, with its hills and bocage landscape.
The département was created in 1790 as Seine-Inférieure, one of five departements that replaced the former province of Normandy. In 1800 five arrondissements were created within the département, namely Rouen, Le Havre, Dieppe, Neufchatel and Yvetot, although the latter two were disbanded in 1926. On 18 January 1955 the name of the département was changed to Seine-Maritime, in order to provide a more positive-sounding name and in-keeping with changes made in a number of other French departements.
The novel La Place by Annie Ernaux largely takes place in Seine-Maritime and describes events and changes that take place in relation to French society in the 20th century especially in relation to the rural population.
Limestone cliffs of Étretat
- Cantons of the Seine-Maritime department
- Communes of the Seine-Maritime department
- Arrondissements of the Seine-Maritime department