俄斯特拉发（捷克语：Ostrava；德语：Ostrau，奥斯特劳），位于摩拉维亚东北部，摩拉维亚-西里西亚州首府，是捷克第三大城市，还是捷克第2大都市圈，仅次于布拉格。同时他还是享有更多法律权利的自治市的行政中心。该市是2015年欧洲文化之都的候选城市。它位于奥德河、奥帕瓦河、Ostravice以及Lucina河的交汇处。在历史上该市的发展很大程度上受当地优质黑煤的开采以及进一步利用的影响，并在捷克斯洛伐克社会主义时期被人们看作是一个工业城市，被称为“共和国钢都”。现在许多重工业企业已倒闭或是改制。人口315,000（2004年）。

Ostrava (Polish:Ostrawa, German:Ostrau) is a city in the north-east of the Czech Republic the capital of the Moravian-Silesian Region. It is located just a few kilometers from the border with Poland, at the meeting point of four rivers: the Odra, Opava, Ostravice and Lučina. In terms of both population and area Ostrava is the third largest city in the Czech Republic, the second largest city in Moravia, and the largest city in Czech Silesia; it straddles the border of the two historic provinces of Moravia and Silesia. The population is currently around 300,000. The wider conurbation – which also includes the towns of Bohumín, Doubrava, Havířov, Karviná, Orlová, Petřvald and Rychvald – is home to around 500,000 people, making it the largest urban area in the Czech Republic apart from the capital Prague. Ostrava grew to prominence thanks to its position at the heart of a major coalfield, becoming an important industrial centre. It used to be nicknamed the country’s “steel heart” thanks to its status as a coal-mining and metallurgical centre, but since the Velvet revolution (the fall of communism in ****) it has undergone radical and far-reaching changes to its economic base. Industries have been thoroughly restructured, and the last coal was mined in the city in 1994. However, the city’s industrial past lives on in the Lower Vítkovice area, a former coal-mining, coke production and ironworks complex in the city centre boasting a unique collection of historic industrial architecture. Lower Vítkovice has applied for inscription on the UNESCO World Heritage List. Since the 1990s Ostrava has been transformed into a modern cultural city, with numerous theatres, galleries and other cultural facilities. It hosts a wide range of cultural and sporting events throughout the year. Among the best known are the Colours of Ostrava multi-genre music festival, the Janáček May classical music festival, the Summer Shakespeare Festival and NATO Days. Ostrava is home to two public universities – the VŠB-Technical University and the University of Ostrava. In 2014 Ostrava was a European City of Sport. The city co-hosted (with Prague) the IIHF Ice Hockey World Championship in 2004 and 2015.