Chelsea porcelain is the porcelain made by the Chelsea porcelain manufactory, the first important porcelain manufactory in England, established around 1743–45, and operating independently until 1770, when it was merged with Derby porcelain. It made soft-paste porcelain throughout its history, though there were several changes in the "body" material and glaze used. Its wares were aimed at a luxury market, and its site in Chelsea, London, was close to the fashionable Ranelagh Gardens pleasure ground, opened in 1742.

Porcelain is a ceramic material made by heating raw materials, generally including kaolinite, in a kiln to temperatures between 1,200 and 1,400 °C. The greater strength and translucence of porcelain, relative to other types of pottery, arise mainly from vitrification and the formation of the mineral mullite within the body at these high temperatures. End applications include tableware, decorative ware such as figurines, toilets and washbasins, and products in technology and industry such as electrical insulators and laboratory ware.