William Russell Watrous III (June 8, 1939 – July 2, 2018) was an American jazz trombonist. He was best known for his version of Sammy Nestico's arrangement of the Johnny Mandel ballad "A Time for Love," which he recorded on a 1993 album of the same name.
In 1971, he played with the jazz fusion group Ten Wheel Drive. Also in the 1970s, Watrous formed his own band, The Manhattan Wildlife Refuge Big Band, which recorded two albums for Columbia Records. The band was later renamed Refuge West when Watrous moved to southern California.
Watrous died in Los Angeles, California on July 2, 2018 at the age of 79.