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.

Religion in Tolna County (2022 census – of those eho declared their religion (62.2%)) In 2015, Tolna had a population of 225,936 and the population density was 61 inhabitants per square kilometre (160/sq mi).

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