Tolna (Hungarian: Tolna vármegye, pronounced [ˈtolnɒ]; German: Komitat Tolnau) is an administrative county (comitatus or vármegye) in present-day Hungary as it was in the former Kingdom of Hungary. It lies in central Hungary, on the west bank of the river Danube. It shares borders with the Hungarian counties of Somogy, Fejér, Bács-Kiskun, and Baranya. The capital of Tolna county is Szekszárd. Its area is 3,703 km² (1,430 sq mi).

Tolna (in Latin: comitatus Tolnensis) was also the name of a historic administrative county (comitatus) of the Kingdom of Hungary. Its territory, which was about the same as that of the present Tolna county, is now in central Hungary. The capital of the county was Szekszárd.

In 2015, Tolna had a population of 225,936 and the population density was 61 inhabitants per square kilometre (160/sq mi).

Besides the Hungarian majority, the main minorities are the Germans (approx. 10,000) and Roma (8,500).

Total population (2011 census): 230,361
Ethnic groups (2011 census): Identified themselves: 214,953 persons:

Approx. 32,000 persons in Tolna County did not declare their ethnic group at the 2011 census.

Religious adherence in the county according to 2011 census:

The Tolna County Council, elected at the 2024 local government elections, is made up of 15 counselors, with the following party composition: