Marion Isaacson Greenstone (1925-2005) was a painter and educator in New York, New York.
Greenstone received her B.A. from Brooklyn College, completed an M.A. at Columbia University, and earned a diploma from Cooper Union. In addition to living in New York, Greenstone also took residences in Italy and Canada, exhibiting frequently in both countries well into the 2000s. Her initial time in Italy was under a Fulbright grant in 1954. While there, Greenstone studied painting and lectured on art. By the end of the decade she had moved with her husband to London, Ontario and gained noteriety there for her artwork. By the late 1960s Greenstone was back in New York working as a teacher for the Pratt Institute. Her activities were then divided between teaching, creating art, and exhibiting her work. During her career, Greenstone's work was included in museum and gallery group shows in the United States, Canada, and Italy, including ones held at the Schneider Gallery in Rome, Brooklyn Museum, and Royal Canadian Academy. She held solo exhibitions in Canada at the Park Gallery, Dorothy Cameron Gallery, and University of Western Ontario; and in the United States at the Bridge Gallery, Sixth Estate Gallery, and Long Island University. Her work can be found in various private and public collections including the Ontario Gallery of Art, Continental Telephone Crop., and the Art Gallery of London. After retiring in 1992 she traveled extensively throughout Europe with her husband, Myron, and others, and continued exhibiting and creating artwork until her death in 2005.