a working community of writers, composers, and visual artists, located on the outskirts of Saratoga Springs, New York, U.S. Yaddo is a nonprofit organization founded in 1900 by New York financier Spencer Trask (1844–1909), his wife, the writer Kate, or Katrina, Nichols Trask (Trask, Kate Nichols) (1853–1922), and philanthropist George Foster Peabody (Peabody, George) (1852–1938) for the purpose of providing a place for artists to reside and work in a quiet, secluded atmosphere conducive to creative endeavours.

During their lifetimes the Trasks frequently entertained artists as houseguests at their Yaddo estate, which included a mansion situated among some 400 acres (160 hectares) of woodland, lakes, and gardens. In 1926, four years after Katrina Trask Peabody's death (she married Peabody in 1920), the plan was put into operation, and Yaddo opened its doors to the first guest-artists. Yaddo is now supported by grants from the New York State Council on the Arts and from the National Endowment for the Arts, as well as by private and corporate funding.

Typically, guests remain for stays of two to eight weeks, and generally 180 to 200 are received annually. Applications are reviewed by an advisory committee of professional artists, and invitations are issued without respect to sex, race, age, or religious affiliation. The quality of one's work is the sole citerion for admission. Among the many notables who have experienced Yaddo's program are Truman Capote (Capote, Truman), John Cheever (Cheever, John), James Baldwin (Baldwin, James), Sylvia Plath (Plath, Sylvia), Katherine Anne Porter (Porter, Katherine Anne), Milton Avery (Avery, Milton), Langston Hughes (Hughes, Langston), and Henri Cartier-Bresson (Cartier-Bresson, Henri).