Tolna (Latin: Comitatus Tolnensis) was an administrative county of the Kingdom of Hungary.

Its territory, which was about the same as that of present Tolna county, is now in central Hungary.

Tolna county arose as one of the first comitatuses of the Kingdom of Hungary, in the 11th century.

Part of Hungary was in the 1500s taken and controlled by the Ottoman Empire during the ruling of Suleiman the Magnificent.

In 1900, the county had a population of 253,182 people and was composed of the following linguistic communities:[1] Total: According to the census of 1900, the county was composed of the following religious communities:[2] Total: In 1910, the county had a population of 267,267 people and was composed of the following linguistic communities:[3] Total: According to the census of 1910, the county was composed of the following religious communities:[4] Total: In the early 20th century, the subdivisions of Tolna county were: