János Donát (born as Johann Daniel Donat) was a German-born Hungarian painter.

János Donát was born as Johann Daniel Donat in Neuzelle, Brandenburg, Prussia on December 22, 1744. He did his elementary and secondary studies in Prague, Bohemia. Then he went to Marienstern Abbey (today in Mühlberg, Germany) where he learnt to draw.

In 1766 at the age of 22 he applied to study at the Academy of Fine Arts Vienna where his masters were Johann Christian Brand, Joseph Kreutzinger, Martin van Meytens, Caspar Franz Sambach, Josef Fischer and Franz Edmund Weirotter and he received a qualification for historical painting of portraits and landscapes. He was at that time already so talented that Weirotter exhibited two of his pictures in the Redouten Saale in the royal palace, the Hofburg.

After finishing his studies he settled in Vienna. As a young painter he became surprisingly successful. His earliest works were three paintings for the Austrian Mint, several life-sized portraits of the royal pair and aristocrats and also some paintings with religious thematic. Unfortunately the most are unknown, but one of them, a life-size portrait of Joseph II from 1781 can be currently found in the collection of the Louvre Museum. His oldest known painting is from 1774 of an unknown nobleman and it is today in Ptuj Castle (Ptuj, Slovenia). The positioning of the model, a slightly pivoting strain and the light-shadow play on the face are all following the traditions of the Baroque portrait painting. Four years later, in 1778, was the portrait of Maria Theresa in mourning dress completed. It shows the empress, unlike the representative Baroque royal portraits, in natural environment without emperor symbols. She sits with a classicist vase and a little Putto-sculpture in her decorated garden on a stone bank heading to the viewers. A typical work of the Enlightenment, free from the Baroque motions and emotions. Reserved residence[clarification needed] characterizes her. It is a typical topic in the era after the death of her husband, Francis I.

In 1779 the city of Teschen (today Český Těšín, Czech Republic and Cieszyn, Poland) asked him to depict the seven ambassadors of the peace conference closing the Silesian Wars. These paintings are in the Muzeum Śląska Cieszyńskiego in Cieszyn. His next important works were the portrait of Putnik Karloviczi Greek metropolitan from 1782, the portrait of the young Moritz, Prince of Dietrichstein from 1788.

After moving to Pest in 1810 he painted some of his most noted classicist portraits such as Ferenc Kazinczy in 1812 and Benedek Virág in 1815.

He was also noted for his compositions such as Resting Venus, Orfeus and Euridike, and Proserpina which were paintings of mythological creatures painted after English copper engravings.

He died in Pest in 1830.