The New York gallery that showed Georgia O'Keeffe's early work was 291.
Alfred Stieglitz operated the gallery at 291 Fifth Avenue, and its address became its name. The space opened in 1905 as the Little Galleries of the Photo-Secession and was later commonly called 291. It became a key venue for European avant-garde art and American modernism.
O'Keeffe's charcoal abstractions were shown there in 1916, before she had a large public reputation. The exhibition helped connect her work with the broader modernist movement, which challenged academic traditions and encouraged abstraction, experimentation, and new approaches to form.
A frequent error is calling the venue the Stieglitz Gallery. Stieglitz was its director, but 291 is the canonical name. The gallery closed in 1917, after which Stieglitz continued promoting artists through other exhibition spaces.