István Küzmics (also known in Slovene as Štefan or Števan Küzmič, c.1723 – December 22, 1779) was the most important Lutheran writer of the Slovenes in Hungary.
He was born at Strukovci, in the Prekmurje region of what was then Vas County, in the Kingdom of Hungary (now in Slovenia). His father György Küzmics (1703–1769) was a tailor. From 1733 to 1747 he went to school in Sopron and in Győr, and studied at the lyceum in Pozsony (now Bratislava). He later became a pastor and teacher in the Slovene-speaking towns of Nemescsó (1751–1755) and Surd (1755–1779), in what is now Zala County, but was then part of Somogy, an area where many Slovene families settled in the 17th and 18th centuries. He also wrote cathechisms and schoolbooks, and he translated the New Testament into Prekmurje Slovene. The translated text, Nouvi zakon ali testamentom, was published in the German town of Halle in 1771. He died at Surd.
- Mária Mukics: Changing World – The Hungarian Slovenes (Változó Világ – A magyarországi szlovének) Press Publica ISSN 1219-5235