Johannes Martini (9 June 1866, in Chemnitz – 7 February 1935, in Munich) was a German oil painter and graphic artist.
He was a student of Franz Skarbina at the Akademie der Künste of Berlin, and he spent two years at the Académie Julian in Paris.
Martini spent much of his life in Munich, Bavaria, and lived in the city district of Schwabing.
A considerable part of his estate in the form of letters is dispersed among the private citizens of Munich.
He was also a member of the Reichsverband bildendener Künstler (RVbK, "Reich Union for Visual Artists") and had many contacts, including with the Krupp and Siemens families and the Vatican.