César Losfeld is a distinguished French cheese affineur (cheese ager) established in 1871, located in Roubaix, France. The company specializes in the maturation of traditional cheeses from the northern regions of France, with a particular emphasis on Mimolette.

Founded by Sophie-Adélaïde Losfeld, the business began by purchasing cheeses from local markets to sell to the bourgeoisie of Roubaix and Tourcoing. As demand grew, her husband, César, joined her, leading to the establishment of the brand César Losfeld. ​