Florine Stettheimer''' (August 29, 1871 – May 11, 1944) was an American painter, designer, Jazz Age saloniste and poet.
With her sisters, Carrie and Ettie, she hosted a salon for modernists in Manhattan, which included Marcel Duchamp, Henry McBride, Carl Van Vechten, Georgia O'Keeffe, as well as many of the most influential modernist writers, actors, poets, artists, singers and thinkers of the time. By 1917, she had developed a uniquely innovative, modernist, and feminine style based on the theatrical stage productions of the Ballets Russes she saw earlier in Paris, and the costume designs and figures she designed for her ballet, ''Orphée of the Quat-z-arts'', ca. 1912. During her lifetime, Stettheimer exhibited her paintings at over 46 of the most important museum exhibitions and Salons in New York and Paris. Despite the regular requests by major gallerists including Alfred Stieglitz to join their galleries, Stettheimer either refused or priced her paintings at such exorbitant prices no one could afford them as she was wealthy and preferred to keep her paintings. As she regularly received positive critical reviews and exhibited in exhibitions, including the first Whitney Biennial and many of the early exhibitions at the Manhattan Museum of Modern Art and the Paris Salon, she was confident of her work and intended to keep it and leave it to a museum when she died. In the mid-1930s, Stettheimer won international acclaim for her costume and set designs (using the innovative material cellophane), for Virgil Thomson and Gertrude Stein's avant-garde opera, ''Four Saints in Three Acts''.
Following her death in 1944, her friend Marcel Duchamp curated a retrospective exhibition of her work at the Museum of Modern Art in 1946 that travelled to major crowds at the San Francisco Legion of Honor Museum and the Arts Club of Chicago. In addition to her many paintings and costume and set designs, Stettheimer designed unique frames for her paintings and matching furniture, and wrote humorous, often biting poetry.
A book of her poetry, ''Crystal Flowers'', was published privately and posthumously by her sister Ettie Stettheimer in 1949. It was reissued to acclaim in 2010.