Sulphur (French: Soufre) is a city in Calcasieu Parish, Louisiana, United States. The population was 22,512 at the 2000 census. Sulphur is a suburb of Lake Charles, and is part of the Lake Charles Metropolitan Statistical Area.
Sulphur began around sulfur mines in the 1900s, which the city is named after. It is in this area that German immigrant Herman Frasch invented the "Frasch method" of mining sulfur, pumping hot steam into the ground, liquidizing the mineral, and pumping the liquid to the surface. This greatly facilitated sulfur mining. The elementary school on S. Huntington Street in downtown Sulphur is named after Dr. Frasch.
The area was expanded with the addition of Cities Service oil refinery, now Citgo. The areas of Maplewood and Hollywood were developed to house refinery workers. The Sulphur area is still mostly dependent on the oil refineries and petrochemical plants for employment.