Sisak-Moslavina County (Croatian: Sisačko-moslavačka županija) is a Croatian county in eastern Central Croatia and southwestern Slavonia. It is named after the city of Sisak and the region Moslavina just across the river Sava. According to 2021 census, it is inhabited by 140,000 people.

This county contains the ancient Roman city of Siscia—today's Sisak. Siscia was the largest city of the region back then, a Pannonian capital, likely due to its position on the confluence of the Kupa and Sava rivers. The city's patron saint is its first Christian bishop, St. Kvirin, who was tortured and almost killed during Diocletian's persecution of Christians. Legend has it that they tied him to a millstone and threw him into a river, but he freed himself from the weight, escaped and continued to preach his faith.

The town may have lost importance with the fall of one empire, but it recovered it soon enough with the rise of another: Sisak became famous for crucial battles between European armies and the Ottoman Turks. In particular, the battle of 1593 when the Ottoman army first suffered a large defeat. The ban Toma Bakač Erdedi who led the defense in this battle became famous throughout Europe.

Today, Sisak features the largest Croatian metallurgic factory (supported by the University of Zagreb's Faculty of Metallurgy also in the city) and the largest oil refinery. These are coupled with the petrochemical facilities in the nearby town of Kutina, the first recorded mention of which was in 1256 by king Béla IV. Moslavina is probably the most picturesque part of this county, with the natural park Lonjsko polje near the rivers Lonja, Ilova and Pakra.

This county also extends far to the south, bordering Bosnia. In this southern part of the county, one can find the small town of Topusko, which boasts one of the spas typical of Central Croatia, although this one's seniority stands out because it dates back to the neolithic age.

Sisak-Moslavina County borders Karlovac County in the west, Zagreb County in the north, Bjelovar-Bilogora County and Požega-Slavonia County in the northeast, and Brod-Posavina County in the east.

Sisak-Moslavina county is subdivided as follows:

Historical populations of Sisak-Moslavina County

Year Pop. ±% 1857 168,292 —     1869 182,656 +8.5% 1880 186,059 +1.9% 1890 215,675 +15.9% 1900 235,514 +9.2% 1910 256,207 +8.8% 1921 248,953 −2.8% 1931 268,287 +7.8% 1948 234,953 −12.4%	Year Pop. ±% 1953 247,482 +5.3% 1961 255,635 +3.3% 1971 258,643 +1.2% 1981 255,292 −1.3% 1991 251,332 −1.6% 2001 185,387 −26.2% 2011 172,439 −7.0% 2021 139,603 −19.0%
Source: Naselja i stanovništvo Republike Hrvatske 1857–2001, Croatian Bureau of Statistics, Zagreb, 2005

As of the 2021 census, the county had 140,549 residents. The population density is 31 people per km.

Croats form the majority with 82.4% of the population, followed by ethnic Serbs at 12.2%.

Directly elected minority councils and representatives are tasked with consulting tasks for the local or regional authorities in which they are advocating for minority rights and interests, integration into public life and participation in the management of local affairs. At the 2023 Croatian national minorities councils and representatives elections Bosniaks, Roma and Serbs of Croatia all fulfilled legal requirements to elect their own 25-member minority councils of the Sisak-Moslavina County while Czechs, Slovaks, Italians and Ukrainians of Croatia were electing individual representatives with representative of the Albanians of Croatia remaining unelected due to the absence of candidatures. Some municipalities, towns or cities in the county elected their own local minority councils as well.

• Roman Catholic Diocese of Sisak
• Serbian Orthodox Eparchy of Gornji Karlovac
• Serbian Orthodox Eparchy of Slavonia

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Sisak-Moslavina County" – news · newspapers · books · scholar · JSTOR (April 2013) (Learn how and when to remove this message)

• Official website (in Croatian)

45°13′15″N 16°15′05″E / 45.22083°N 16.25139°E / 45.22083; 16.25139