Gherasim Luca (23 July 1913 – 9 February 1994) was a French-speaking Surrealist theorist and poet. Born Salman Locker in Romania and also known as Zolman Locker, Gherashim Luca, Costea Sar, and Petre Malcoci, he regarded himself as an apatrid. His entire post-Second World War work is written in French. He is frequently cited in the works of Gilles Deleuze and Félix Guattari.
Born in Bucharest the son of a Jewish tailor, Berl Locker (died 1914), he spoke Yiddish, Romanian, German, and French. During 1938, he traveled frequently to Paris where he was introduced to the Surrealist circles. World War II and the official antisemitism in Romania forced him into local exile. During the short pre-Communist period of Romanian independence, he founded a Surrealist artists group, together with Gellu Naum, Paul Păun, Virgil Teodorescu and Dolfi Trost.
His first publications, including poems in French followed. He was the inventor of cubomania and, with Dolfi Trost, the author of the statement "Dialectic of Dialectic" in 1945. Harassed in Romania and caught while trying to flee the country, the self-called étran-juif ("StranJew") finally left Romania in 1952, and moved to Paris through Israel.
There he worked among others with Jean Arp, Paul Celan, François Di Dio and Max Ernst, producing numerous collages, drawings, objects, and text-installations. From 1967, his reading sessions took him to places like , Oslo, Geneva, New York City, and San Francisco. The 1988 TV-portrait by Raoul Sanglas, Comment s'en sortir sans sortir, made him famous for a larger readership.