János Greguss (German: Johann Baptist Gregosch; 3 May 1838, Pozsony- 31 May 1892, Budapest) was a Hungarian genre and landscape painter.
Following his graduation, he was awarded a stipend by József Eötvös that enabled him to study abroad.
He painted with a loosely Academic approach and was heavily influenced by German art.
In terms of subject matter, he tended to prefer simple, cheerful scenes; mostly from family life.
Among his best known students were Lipót Ács [hu], Adolf Fényes, Lajos Márk and János Tornyai.