William Russell Watrous III (born June 8, 1939 in Middletown, Connecticut) is a jazztrombonist. He is perhaps best known by casual fans of jazz music for his rendition 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. A self-described "bop-oriented" player, he is well known among fellow trombonists as a master technician and for his mellifluous sound.