János Thorma (24 April 1870 – 5 December 1937) was a Hungarian painter.
A representative figure of the Nagybánya artists' colony, which started in 1896, in Nagybánya, Austria-Hungary (today Baia Mare, Romania), 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.
In 1966, the Hungarian National Gallery held a major commemorative exhibition, The Art of Nagybánya, commemorating the innovations of Thorma and fellow artists.
In February 2013, it opens a major retrospective of more than 100 pieces of János Thorma's work, drawing from numerous institutions and private collectors in Europe.