Zagorsk Optical-Mechanical Plant (Russian: Загорский оптико-механический завод) is a company based in Sergiyev Posad (formerly called Zagorsk), Moscow Oblast, Russia. It is part of Shvabe Holding of Rostec,^[1] a Russian state-owned defense conglomerate.

The Zagorsk Optical-Mechanical Plant is a producer of pyrotechnics^[2] and precision optical equipment for the military, such as active infrared night vision devices and binoculars. A report last updated in June 1994 stated that it had increased the proportion of its civilian production, and adapted some of its military products, such as night vision devices, to civilian use.^[3] On 8 June 2022, the plant experienced a fire, one of several unusual fires in 2022 in Russia.^[4]

On 9 August 2023, the plant experienced a massive explosion and was evacuated.^[5] After the blast, the governor in the region claimed that the factory was actually mainly manufacturing "pyrotechnics".^[2]