Glenn Cannon (21 November 1932 - 20 April 2013) was a Hawaii-based actor and educator best known for his roles on Hawaii Five-O and Magnum, P.I. He also appeared on Lost in a pair of different roles.
Cannon's career began back to the 1950s with roles in shows like Alfred Hitchcock Presents, The Outer Limits and Combat!. On Magnum, P.I., Cannon was featured as Dr. Ibold, while on Hawaii Five-O, he played Attorney General John Manicote.
In recent years, he served as president of the Hawaii chapter of the Screen Actors Guild and its successor group, SAG-AFTRA.
He was a Professor of Theatre at the University of Hawaii at Manoa and also co-Director of the UH-Manoa Cinematic and Digital Arts program.