Ostroh

For other uses, see Ostroh (disambiguation).

Ostroh Острог
City
Clockwise from top: Old Campus of the Ostroh Academy Scientific Library of the Academy Lutsk Gate Tower Guard Tower of the Ostroh Castle Church of the Dormition of the Virgin Mary
Flag Coat of arms
Ostroh Location within Rivne Oblast Ostroh Location within Ukraine
Coordinates: 50°20′0″N 26°31′0″E
Country	Ukraine
Oblast	Rivne Oblast
Raion	Rivne Raion
Hromada	Ostroh urban hromada
First mentioned	1100
City rights	1795
Government
• Mayor	Yuri Yahodka
Area
• Total	10.9 km2 (4.2 sq mi)
Population  (2001 census)
• Total	14,801
• Density	1,358/km2 (3,520/sq mi)
Time zone	UTC+2 (EET)
• Summer (DST)	UTC+3 (EEST)
Postal code	35800—35807
Area code	+380 3654
Sister cities	Gniew, Sandomierz, Bieruń, Beroun, Beaufort, South Carolina, Athens, Ohio, Torre del Greco
Website	https://ostroh-rada.gov.ua/

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Ostroh (Ukrainian: Острог [oˈstrɔɦ] ^ⓘ, Polish: Ostróg) is a city in Rivne Oblast, western Ukraine. It is situated on the Horyn River. Ostroh was the administrative center of Ostroh Raion until 2020, but as a city of oblast significance did not belong to the raion. Currently the city is the centre of Ostroh urban hromada. Population: 14,894 (2022 estimate).

The Ostroh Academy was established here in 1576, the first higher educational institution in modern Ukraine. Furthermore, in the 16th century, the first East Slavic books, notably the Ostrog Bible, were printed there.