Merle John Isaac (October 12, 1898 – March 11, 1996) was an American composer and prolific arranger who focused on arranging famous pieces for performers of lower experience, especially school orchestras.

After graduating from the VanderCook College of Music in 1932, he began to teach at John Marshall High School, in Chicago, Illinois.

"[3] Isaac's family included his wife, Margaret, and their daughter, Margrethe (May 6, 1927 – August 14, 2007).

[citation needed] Isaac died of natural causes on March 11, 1996, in Des Plaines, Illinois, at the age of 97.

This article about a United States composer born in the 19th century is a stub.