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.

"[1] He gave many lectures throughout his life, but never wrote a book or article on his unconventional approach to trumpet.

The only official documentation of his approach is a three-videotape series, A New and Different Way of Getting More Music out of Trumpet.

His approach is carried on by his former students, many of whom hold positions at music schools throughout the U.S. and around the world.