G. Schirmer, Inc. is an American classical music publishing company based in New York City, founded in 1861.

In 1964, Schirmer acquired Associated Music Publishers (BMI) which had built up an important catalog of American composers including Elliott Carter, Henry Cowell, Roy Harris, Charles Ives, Walter Piston, and William Schuman, adding to a Schirmer's ASCAP roster which had already included Samuel Barber, Leonard Bernstein, Morton Gould, Gian Carlo Menotti, and Virgil Thomson, as well as composers from the earlier part of the century such as Charles Tomlinson Griffes, Dee Libbey, Charles Martin Loeffler, John Alden Carpenter, and Percy Grainger.

As the sale of Schirmer did not include The Musical Quarterly, the future of the journal remained uncertain until its transition in 1989 to publisher Oxford University Press.

The last member of the family named for the founder was Gus Schirmer IV, a theatrical director, producer, and agent, who died in 1992 at the age of 73.

[6] The Schirmer/AMP catalog includes composers such as Billy Joel, John Corigliano, Richard Danielpour, Gabriela Lena Frank, John Harbison, Aaron Jay Kernis, Leon Kirchner, Peter Lieberson, André Previn, Gertrude Ross, Bright Sheng, Tan Dun, Du Yun, Robert Xavier Rodriguez, and Joan Tower.