| En Name: | Zarechny |
| Ru Name: | Заречный |
| Coordinates: | 53.2°N 45.1667°W |
| Map Label Position: | right |
| Image Coa: | Coat of Arms of Zarechny (Penza oblast).png |
| Federal Subject: | Penza Oblast |
| Adm City Jur: | town of oblast significance of Zarechny |
| Adm Ctr Of: | town of oblast significance of Zarechny |
| Inhabloc Cat: | Town |
| Urban Okrug Jur: | Zarechny Urban Okrug |
| Mun Admctr Of: | Zarechny Urban Okrug |
| Leader Title: | Head |
| Leader Name: | Vyacheslav Gladkov |
| Pop 2010Census: | 63601 |
| Pop 2010Census Rank: | 249th |
| Established Date: | 1958 |
| Dialing Codes: | 8412 |
| Website: | http://zarechny.zato.ru/ |
Zarechny (Russian: Заре́чный), called Penza-19 (Russian: Пе́нза-19) in 1962–1992, is a closed town in Penza Oblast, Russia, located 12km (07miles) east of Penza. Population:
It was formed in 1958, on the territory of Penza's Zarechny City District. It was closed and named Penza-19 in 1962 and renamed Zarechny in 1992.
Within the framework of administrative divisions, it is incorporated as the town of oblast significance of Zarechny—an administrative unit with the status equal to that of the districts.[1] As a municipal division, the town of oblast significance of Zarechny is incorporated as Zarechny Urban Okrug.[2]
Zarechny's main employer is Rosatom and a major industry is manufacture of nuclear weapon components. Other industries include electronics and software.