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.

Syrmia is a region of the southern Pannonian Plain, which lies between the Danube and Sava rivers. It is divided between Serbia and Croatia. Most of the region is flat, with the exception of the low Fruška gora mountain stretching along the Danube in its northern part.