John La Montaine, American pianist and composer (b. 1920)
John Maynard La Montaine, also later LaMontaine, (March 17, 1920 – April 29, 2013) was an American pianist and composer, born in Oak Park, Illinois, who won the 1959 Pulitzer Prize for Music for his Piano Concerto No. 1 "In Time of War" (1958), which was premiered by Jorge Bolet.

His teachers included Howard Hanson, Bernard Rogers, and Nadia Boulanger. His works have been performed by Leontyne Price, Jessye Norman, Adele Addison, Donald Graham, Eleanor Steber and Jorge Bolet.

In honor of the American Bicentennial celebration in 1976, he was commissioned to create a choral work for the Penn State Institute for Arts and Humanistic Studies. The opera, entitled Be Glad Then America, was performed by the University Choirs, under the direction of Sarah Caldwell. The folk singer Odetta appeared as the Muse for America.

La Montaine lived in Hollywood, Los Angeles, California. His publishing company, Fredonia Press, is named for the street on which he lived. His business partner was the composer and pianist Paul J. Sifler (1911–2001).