István Ballér or Balliér (Slovene: Števan Baler August 28, 1760 – April 2, 1835) was an ethnic Slovene Lutheran priest, dean of Zala and Somogy, and writer.
He lived and worked in the Kingdom of Hungary.
Born in the Slovene March (Prekmurje) in the village of Loncarovci (then officially Geroháza), he received his schooling in Orség and Nemescsó and higher education in Sopron.
He was a cantor and then teacher among the Somogy Slovenes in Kissomlyó, relocated to Porrogszentkirály in 1784, and was then dean of the county from 1805 onward.
Ballér strongly opposed the official replacement of Prekmurje Slovene by Hungarian in the 1830s.
He wrote several hymns in the Prekmurje dialect of Slovene.