John Koch (August 18, 1909 – April 19, 1978) was an American painter, and an important figure in 20th century realist painting. His early work may be considered Impressionist. He is best known for his light-filled realist paintings of urban interiors, often featuring classical allusions, and set in his own Manhattan apartment.As visible in the The Sculptor (1964, oil on canvas, 80" x 59 7/8", Brooklyn Museum), much of Koch's work is made up of portraits and social scenes, including cocktail parties and scenes with the artist at work with his models. He was a mentor of the painter Charles Pfahl (b. 1946). In 1953 he was elected into the National Academy of Design as an Associate member and became a full Academician in 1954.