Oster urban hromada (Ukrainian: Остерська міська громада) is a hromada of Ukraine, located in Chernihiv Raion, Chernihiv Oblast.

Its administrative center is the city Oster.

[1] It has an area of 402.4 square kilometres (155.4 sq mi) and a population of 9,017, as of 2020.

[2] The hromada contains 22 settlements: 1 city (Oster) and 21 villages:[2]