Tovarnik is a municipality in the Vukovar-Syrmia County in Croatia next to the border with Serbia with the town of Šid and the village of Ilinci on the other side of the border. According to the 2001 census, there are 2,775 inhabitants, 91.06% which are Croats. The municipality is part of Syrmia. It is the birthplace of great Croatian poet Antun Gustav Matoš. Tovarnik is underdeveloped municipality which is statistically classified as the First Category Area of Special State Concern by the Government of Croatia.

Vukovar-Srijem County, Vukovar-Sirmium County or Vukovar-Syrmia County, named after the eponymous town of Vukovar and the region of Syrmia, is the easternmost Croatian county. It includes the eastern parts of the region of Slavonia and the western parts of the region of Syrmia, as well as the lower Sava river basin, Posavina and Danube river basin Podunavlje. Due to the overlapping definitions of geographic regions, division on Slavonia and Syrmia approximately divides the county vertically into north-west and south-east half, while division on Posavina and Podunavlje divides it horizontally on north-east and south-west half.