Bob Stewart (born February 3, 1945) is an American jazz tuba player and music teacher.

[2] Stewart has toured and recorded with such artists as Charles Mingus, Gil Evans, Carla Bley, Muhal Richard Abrams, David Murray, Taj Mahal, Dizzy Gillespie, McCoy Tyner, Freddie Hubbard, Don Cherry, Nicholas Payton, Wynton Marsalis, Charlie Haden, Lester Bowie, Bill Frisell, Globe Unity Orchestra and many others in the United States, Europe, and Eastern Asia.

[2] He was a frequent collaborator with saxophonist Arthur Blythe from the 1970s into the early 2000s, often taking the place of the string bass that traditionally supports a jazz ensemble.

In their review of Blythe's album Lenox Avenue Breakdown, the editors of The Penguin Guide to Jazz called Stewart's title track solo "one of the few genuinely important tuba statements in jazz.

"[3] With Ahmed Abdullah's Diaspora and Francisco Mora Catlett's AfroHORN With Ray Anderson With Arthur Blythe With Henry Butler With Uri Caine With Don Cherry With Gil Evans With Bill Frisell With Dizzy Gillespie and Machito With Howard Johnson and Gravity With Chris Joris With David Murray With Charles Mingus With Sam Rivers With Herb Robertson