The American Composers Alliance (ACA) is an American nonprofit composer service organization dedicated to the publishing and promoting of American contemporary classical music. Founded in 1937 by Aaron Copland, Milton Adolphus, Marion Bauer and others, it is the oldest national organization of its kind, and represents over 200 member composers.
The organization is based in Manhattan, New York City, New York. From 1951, ACA presented the Laurel Leaf Award to individuals and organizations in recognition of "distinguished achievement in fostering and encouraging American music."
The American Composers Alliance publishes musical scores under the imprint American Composers Edition (ACE). From 2001 through 2013, ACA held an annual festival of American music presenting 6-8 concerts with more than 30 composers from across the country. Past festivals received favorable reviews from The New York Times and New Music Connoisseur. In 2017, ACA celebrated its 80th anniversary.