János Thorma was a Hungarian painter. A representative figure of the Nagybánya artists' colony, which started in 1896, in Nagybánya, Austria-Hungary, he moved through different styles, shifted from the naturalism that was the aesthetic of the colony, to historical subjects, to romantic realism and to a Post-Impressionism style. His work is held by the Hungarian National Gallery, the Thorma János Múzeum, regional museums and private collectors.

The Nagybánya artists' colony was an art colony in Nagybánya, a town in eastern Hungary that became Baia Mare in Romania after World War I. The colony started as a summer retreat for artists, mainly painters from Simon Hollósy's szabadiskola in Munich. The original group focused on plein-air painting.