| Latitude | 45.48°N |
| Longitude | 16.36°E |
| Mayor | ? |
| Surface (km²) | ? |
| Population (2006) | 35,478 * |
| Time zone (UTC) | UTC+1 Central European Time |
Sisak (German: Sissek, Hungarian: Sziszek, Italian: Siscia) is a city in central Croatia. It has a population of 45,992 (2001) and is the administrative centre of Sisak-Moslavina county. Sisak is located at the confluence of the Kupa, Sava, and Odra rivers, 57 km southeast of the Croatian capital Zagreb.
Sisak is Croatia's biggest river port and a centre of river shipping industry (Dunavski Lloyd). Sisak lies on the main road Zagreb-Sisak-Petrinja (M12.2) and the railroad Zagreb-Sisak-Sunja.
The 16th century triangular fortress of the Old Town, well-preserved and turned into the Native Museum, is the main destination of every tourist. The fortress is famous for the victory of the joint forces of Croats and Slovenians over the Turks in 1593, known as the Battle of Sisak. It was the very first significant defeat of the up-to-then invincible Turkish army on European territory.
The Baroque palace of Mali Kaptol, the classicist Veliki Kaptol, the brick Stari most ("Old Bridge") over the Kupa, and the ethnological park are the most frequently visited landmarks.
During World War II, Sisak was the site of a concentration camp which was part of the large Jasenovac cluster where Serbs, Roma, and Jews were killed.
The city hosts University of Zagreb's Faculty of Metallurgy and the department of the Nautical Faculty.
Sisak has many rich mineral springs (spas) with healing properties in the temperature range from 42 to 54 °C.
Sports and recreation facilities in the town and the surroundings include mainly the waters and alluvial plains a public beach on the Kupa. All rivers (Kupa, Odra, Sava) with their backwaters offer fishing opportunities. There are hunting grounds in the regions of Turopolje and Posavina. Sisak is the starting point for sightseeing tours into Lonjsko Polje (Field of Lonja river) nature park.
The local football club is NK Segesta.
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