| La Seyne-sur-Mer | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason La-Seyne-sur-Mer.svg |
| Arrondissement: | Toulon |
| Canton: | La Seyne-sur-Mer-1 and 2 |
| Insee: | 83126 |
| Postal Code: | 83500 |
| Mayor: | Nathalie Bicais[1] |
| Party: | LR |
| Term: | 2020 - 2026 |
| Intercommunality: | Métropole Toulon Provence Méditerranée |
| Coordinates: | 43.1°N 5.883°W |
| Elevation M: | 9 |
| Elevation Min M: | 0 |
| Elevation Max M: | 352 |
| Area Km2: | 22.17 |
La Seyne-sur-Mer (in French pronounced as /la sɛn syʁ mɛʁ/; "La Seyne on Sea"; Occitan (post 1500);: La Sanha), or simply La Seyne, is a commune in the Var department in the Provence-Alpes-Côte d'Azur region in Southeastern France. La Seyne-sur-Mer, which is part of the agglomeration of Toulon, is situated adjacent to the west of the city.
The population data in the table and graph below refer to the commune of La Seyne-sur-Mer proper, in its geography at the given years. The commune ceded territory to the new commune of Saint-Mandrier-sur-Mer in 1950.
La Seyne-sur-Mer owed its importance to the shipbuilding trade, the Société des Forges et Chantiers de la Mediterranée having here one of the finest shipbuilding yards in Europe (it is a branch of the larger establishment at Marseille), which gave employment to about 3,000 workers.
In recent years the town has moved from its traditional industries to tourism. The docks previously used have had extensive work and now comprise a park, marinas and a new (2010) hotel overlooking Toulon and the marinas.
The population is diverse in origins and the outer suburbs are undergoing a transformation with old multi storey apartments being replaced with modern developments. La Seyne has a railway station, Gare de La Seyne-Six-Fours, on the line from Toulon to Marseille.
Iraq's "Osiris class" nuclear reactors, later destroyed by Israel in Operation Opera, were built in La Seyne-sur-Mer.[2]