Louis Marcoussis, formerly Ludwik Kazimierz Wladyslaw Markus or Ludwig Casimir Ladislas Markus, (1878 or 1883, Łódź – October 22, 1941, Cusset) was a Polish-French avant-garde painter active primarily in Paris. Markus studied law in Warsaw before attending the Kraków Academy of Fine Arts, and later moved to Paris to study under Jules Lefebvre at the Académie Julian. His work was first featured in a major exhibition at the Salon d'Automne in 1905. In Paris, he became acquainted with prominent artists and writers in the cafes of Montmartre and Montparnasse.
Guillaume Apollinaire, an artist and poet of Polish descent active in the Parisian avant-garde circles, suggested his French name, Marcoussis, named after a village near Paris. Marcoussis's early paintings were influenced by Impressionism, but he later became a part of the Cubist movement around 1911. He exhibited his works across Europe and the United States and held his first solo exhibition in Paris in 1925.
Starting around 1930, Marcoussis focused more on printmaking and illustration, inspired by works of poets like Apollinaire and Éluard. During the late 1930s, he collaborated with Spanish surrealist Joan Miró, teaching him etching techniques which resulted in Miró’s renowned Black and Red Series. During the Nazi occupation of Paris in 1940, Marcoussis and his wife Alice moved to Cusset near Vichy where he died on 22 October 1941.