Ștefan Foriș (born István Fóris, also known as Marius; May 9, 1892 – summer of 1946) was a Romanian communist activist and journalist who served as general secretary of the Romanian Communist Party (PCR or PCdR) between 1940 and 1944.
Foriș was born in Tatrang (Tărlungeni), Transylvania (part of Austria-Hungary at the time), and was a member of the Hungarian minority. His parents were István Fóris and Anna Kocsis. He completed his secondary studies in exact sciences at a lyceum in Brașov. During World War I, he was drafted in the Austro-Hungarian Army, rising to the rank of hadnagy. He also graduated from the Eötvös Loránd University's Faculty of Physics and Mathematics (1919). Aside from his native language and Romanian, he was able to speak German and French, and began to work as a journalist.
An active socialist, he took part in the movement that led to the creation of a Soviet Republic in Hungary, and joined the Hungarian Communist Party. After its disestablishment, Foriș settled inside the Kingdom of Romania, entered the Socialist Party in Brașov, and began contributing to left-wing publications.