British art dealer who from 1963 to 1972 ran a gallery in New Bond Street, London. He primarily exhibited abstract art, especially the Post-Painterly Abstraction supported by Clement Greenberg. His first exhibition was work by Kenneth Noland, but he also showed some of the most important British artists of the period, including Richard Smith, Anthony Caro, Bernard Cohen, and David Hockney, the only figurative painter associated with the gallery. Kasmin appears flattened behind a glass plate in Hockney's 1963 painting Play Within a Play. The historical significance of the gallery was partly in its design, described by Kasmin as ‘a machine for looking at pictures in’. A single spacious room with white walls and—a defiantly anti-domestic touch—a curious ridged rubber floor, it was a highly appropriate setting for large-scale abstract art, the ultimate destiny of which was anticipated to be the museum. After the closure of the New Bond Street gallery, Kasmin continued to work as a dealer in partnership with others.