Clarion Co., Ltd is a Japanese manufacturer of car audio, automotive navigation systems, AutoPCs, visual equipment, bus equipment, and communication equipment. It is majority owned by Hitachi.

Up until the end of 2005, products in Japan were marketed under the brand name AddZest, while outside of Japan the same product typically carried the Clarion name brand. This was changed in 2006, and the brand "Clarion" along with a redesigned logo are now used worldwide. It is known for its close relationship with Nissan, who uses Clarion products almost exclusively in its vehicles. Clarion has an OEM relationship with many automotive companies, providing car headunits and components to them for their production vehicles. Clients include Suzuki, Ford, Volkswagen, Proton, Subaru and Peugeot.