| En Name: | Ryazhsk |
| Ru Name: | Ряжск |
| Coordinates: | 53.7°N 43°W |
| Map Label Position: | right |
| Image Coa: | Coat of Arms of Ryazhsk (Ryazan oblast) (1779).png |
| Federal Subject: | Ryazan Oblast |
| Adm District Jur: | Ryazhsky District |
| Adm Selsoviet Jur: | Ryazhsk |
| Adm Selsoviet Type: | Town of district significance |
| Adm Ctr Of1: | Ryazhsky District |
| Adm Ctr Of2: | town of district significance of Ryazhsk |
| Inhabloc Cat: | Town |
| Mun District Jur: | Ryazhsky Municipal District |
| Urban Settlement Jur: | Ryazhskoye Urban Settlement |
| Mun Admctr Of1: | Ryazhsky Municipal District |
| Mun Admctr Of2: | Ryazhskoye Urban Settlement |
| Pop 2010Census: | 21674 |
| Established Date: | 1502 |
| Established Title: | Known since |
| Postal Codes: | 391960, 391962–391964, 391999 |
Ryazhsk (ru|Ряжск) is a town and the administrative center of Ryazhsky District in Ryazan Oblast, Russia, located 115km (71miles) south of Ryazan, the administrative center of the oblast. Population: 26,000 (1974).
It has been known to exist since 1502. In the late 16th century, it was a part of the Great Abatis Border and guarded the Ryazhsk portage from the Don to the Oka River.
Within the framework of administrative divisions, Ryazhsk serves as the administrative center of Ryazhsky District. As an administrative division, it is incorporated within Ryazhsky District as the town of district significance of Ryazhsk. As a municipal division, the town of district significance of Ryazhsk is incorporated within Ryazhsky Municipal District as Ryazhskoye Urban Settlement.[1]