Vinkovci is a city in Slavonia, in the Vukovar-Syrmia County in eastern Croatia. The city settlement's population was 28,111 in the 2021 census, while the total population was 30,842, making it the largest town of the county. Surrounded by many large villages, it is a local transport hub, particularly because of its railways.

Slavonia is, with Dalmatia, Croatia proper, and Istria, one of the four historical regions of Croatia. Located in the Pannonian Plain and taking up the east of the country, it roughly corresponds with five Croatian counties: Brod-Posavina, Osijek-Baranja, Požega-Slavonia, Virovitica-Podravina, and Vukovar-Syrmia, although the territory of the counties includes Baranya, and the definition of the western extent of Slavonia as a region varies. The counties cover 12,556 square kilometres or 22.2% of Croatia, inhabited by 806,192—18.8% of Croatia's population. The largest city in the region is Osijek, followed by Slavonski Brod and Vinkovci.