Marian MacDowell (maiden name Marian Griswold Nevins) (November 22, 1857 – August 23, 1956) was a pianist, and in 1907 the founder and developer of the MacDowell Colony, an art colony in Peterborough, New Hampshire, United States. Her leadership of the Colony through two world wars, the Great Depression and other challenges created one of the foremost art institutions in the United States, which cultivated the work of generations.