Cosina Co., Ltd. is a designer and manufacturer of lenses and cameras. It also manfactures glass. The company is based in Nakano, Nagano Prefecture, Japan. The company was originally named Nikō, and changed its name to Cosina in 1973.
Cosina also leases the Voigtländer brand from the German company Ringfoto GmbH. Cosina specializes in making equipment distributed under other brands, such as Vivitar.
In Japan, Cosina products are distributed by Kenko-Tokina.