Johannes Greenberg was an Estonian painter.

He studied at Ants Laikmaa's atelier school from 1904 to 1905. He then studied at Munich Art Academy from 1910 to 1913 . After graduating he moved to Moscow and until 1920 he was a freelance artist. In 1920 he returned to Estonia, Tallinn.

His style of painting changed through time. In 1920s he fostered rather dark paintings with expressive style. In the beginning of 1930s he fostered art deco style.