Ágoston Valentiny (6 October 1888 – 21 August 1958) was a Hungarian politician and jurist, who served as Minister of Justice in the Interim National Government.
He was born into a working-class family with six children.
His father was a machine fitter and engineer.
Valentiny finished his law studies in Kolozsvár.
He joined the Hungarian Social Democratic Party on 1 January 1919.
During the German occupation in 1944 he was interned.
After the "Liberation" of Szeged he became mayor of the town.
He was a member of the Interim National Assembly.
After the 1945 elections he had to resign from the ministerial position because of the communists' attacks.
After that he worked as a lawyer.
He was arrested and sentenced in a show trial in 1950.