'Leningrad Optical Mechanical Association') is a manufacturer of medical and motion-picture lenses and equipment based in St. Petersburg, Russia.

Today LOMO makes military optics, scientific research instruments, criminological microscopes, medical equipment, and a range of consumer products.

Known as GOMZ (State Optical-Mechanical Plant), the company was transformed under the direction of Mikhail Panfilov, who united several industries and founded the LOMO Association in 1962.

The company went public in 1993, and was renamed LOMO PLC; it is traded on the RTS Classic Stock Market.

Military equipment and science research instruments make a significant share of production for export to such countries as Israel, India, United States, Canada, Mexico, and other international markets.