István Szent-Iványi (born 12 November 1958, Kecskemét, Hungary) is a Hungarian politician, Hungarian Ambassador to Slovenia, founding member of the Alliance of Free Democrats political party, and former Member of the European Parliament (MEP) for the Alliance of Free Democrats, part of the European Liberal Democrat and Reform Party.
Szent-Iványi has been chief foreign policy advisor to the Hungarian Liberal Party between October 2015 and April 2018 .