István Hiller (born 7 May 1964) is a Hungarian politician and former chairman of the ruling Hungarian Socialist Party between 16 October 2004 and 24 February 2007, succeeding László Kovács, succeeded by Ferenc Gyurcsány.

A co-founder of his party, Hiller was Minister of National Cultural Heritage under the government of Ferenc Gyurcsány from 2003 to 2005 before being replaced by András Bozóki.

In 2016, Hiller was elected caucus chair of MSZP.

[1] He earned a degree in history and latin from the Faculty of Humanities of the Eötvös Loránd University.

He speaks German, Latin and Ancient Greek fluently, as well as Italian and English.