Marc Klionsky (1927–2017) was a Russian-American artist who worked in New York City from 1974.

Klionsky developed a style of American Realism uniquely defined by his classical training in the Soviet Union and his perspective of daily life in New York and America. Over the course of his career, Klionsky painted portraits of prominent world figures who shaped the 20th century.
During his lifetime, Marc Klionsky's paintings and prints were exhibited throughout the Soviet Union, Europe, America, and Asia, as well as Australia and New Zealand. His Soviet works were exhibited in the Tretyakov National Gallery in Moscow and the State Russian Museum in Leningrad multiple times throughout the 1950s. In 1962, his work was shown alongside that of Marc Chagall at Grosvenor Gallery in London. Separately, his work was shown along with other Soviet artists at the time in West Berlin, Hiroshima, Rome, and New York.

After emigrating to New York in 1974, his first international exhibition was held in Paris at the Salon des Reprouves with Galleries Hardy in 1978. His first solo New York show took place a Nakhamkin Fine Arts Gallery on Madison Avenue in 1979, after which Klionsky was represented by Hammer Galleries for the remainder of his career.

Klionsky had several solo shows in Europe between 1991 and 1992, showing at the Musée d’Art Contemporain in Lausanne, Switzerland, the Salon Internationale des Musées at the Grand Palais in Paris, France, and his "God Bless America" traveling retrospective that began at the St. Ingbert Museum in Germany.