LOMO (Russian: Ленинградское Oптико-Mеханическое Oбъединение, romanized: Leningradskoye Optiko-Mekhanicheskoye Obyedinenie, lit.

'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.

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.