Mark George Tobey (December 11, 1890 – April 24, 1976) was an American painter. His densely structured compositions, inspired by Asian calligraphy, resemble Abstract expressionism, although the motives for his compositions differ philosophically from most Abstract Expressionist painters. His work was widely recognized throughout the United States and Europe. Along with Guy Anderson, Kenneth Callahan, Morris Graves, and William Cumming, Tobey was a founder of the Northwest School.