Bruce Johnstone (born September 1, 1943) is a New Zealand-American jazz baritone saxophonist.

Born in Wellington, New Zealand, Johnstone was a member of Maynard Ferguson's band from 1972 to 1976, after having played in Denmark with Ben Webster and Dexter Gordon,[1] and in London with Stan Kenton.

[2][3] He regularly featured in Down Beat magazine's Readers' Poll behind Gerry Mulligan and Pepper Adams.

He taught at the State University of New York at Fredonia as the director of jazz studies for 15 years until 2016.

He has also been a featured soloist on Ken Poston's big band tribute concerts in Los Angeles.