William Alexander Adam (October 21, 1917 – November 25, 2013) was an American trumpeter, respected pedagogue, and Professor Emeritus at Indiana University. He was highly analytical as a teacher, but always avoided discussing the mechanical aspects of trumpet playing with a student. Instead he "taught" by demonstration and by explanation in terms of sound. In his own words, "If your mind leaves the sound of the horn, obstacles will appear." He died on November 25, 2013 in Bloomington, Indiana.