Harry R. Humphries (born November 17, 1940) is a former United States Navy SEAL who currently works as a consultant and actor in Hollywood films.

After graduating from Admiral Farragut Academy and attending Rutgers University in New Jersey, Humphries joined the Navy where he was assigned to UDT 22 and SEAL Team 2.

After a career with Henkel KGaA, the German Multi National Chemical Company, he moved to California, where he started Global Study Group, Inc. ("GSGI").

Humphries was involved in over 200 combat missions and served two tours in Vietnam, first as a member of Eight Platoon, SEAL Team TWO under Lt Marcinko, and then later as a "PRU Advisor" with Phoenix Program's Counter-Terrorism unit.

While most of his work is with GSGI, Humphries also owns and operates ISS, a security consulting firm specializing in government contracts related to domestic counter-terrorism preparedness with a focus on Weapons of Mass Destruction.