Ostrov nad Oslavou is a market town in Žďár nad Sázavou District in the Vysočina Region of the Czech Republic. It has about 1,000 inhabitants.

The village of Suky is an administrative part of Ostrov nad Oslavou.

Ostrov nad Oslavou is located about 9 kilometres (6 mi) south of Žďár nad Sázavou and 30 km (19 mi) east of Jihlava. It lies in the Křižanov Highlands. The highest point is at 584 m (1,916 ft) above sea level. The market town is situated on the Oslava River, at its confluence with the stream Bohdalovský potok. There are several fishponds around the market town.

The first written mention of Ostrov is from 1355. It was probably founded shortly after 1250. During the Thirty Years' War, in 1621, Ostrov was completely burned down, but was renewed before the war ended. The village of Suky was first documented in 1644. In 1709, Ostrov was referred to as a market town for the first time.

In 1920, the name of the municipality was changed from Ostrov to Ostrov nad Oslavou. The municipality was officially promoted to a market town in 1922. In 1960, Suky was joined to Ostrov nad Oslavou.

Historical population

Year Pop. ±% 1869 956 —     1880 912 −4.6% 1890 839 −8.0% 1900 804 −4.2% 1910 748 −7.0%	Year Pop. ±% 1921 762 +1.9% 1930 706 −7.3% 1950 674 −4.5% 1961 742 +10.1% 1970 804 +8.4%	Year Pop. ±% 1980 815 +1.4% 1991 873 +7.1% 2001 887 +1.6% 2011 905 +2.0% 2021 925 +2.2%
Source: Censuses

The I/37 road, which connects the D1 motorway with Žďár nad Sázavou and continues to Pardubice, runs through Ostrov nad Oslavou.

Ostrov nad Oslavou is located on the railway line Žďár nad Sázavou–Křižanov.

The main landmark is the Church of Saint James the Great. It was rebuilt into its present form in 1885. It has a separate bell tower, which dates from 1845.

• Official website