Abstract: A helmet restraint device for operationally securing a helmet worn by a driver, pilot, or occupant of a high-performance vehicle (such as a racecar, aircraft, or boat) to the vehicle's seat belt assembly. The helmet restraint device reduces potentially injurious forces to the occupant's head and neck during high-deceleration of the vehicle, particularly a frontal collision. The helmet restraint device includes a high strength, lightweight rod disposed behind and below the occupant's neck, just beneath the shoulder harness, and a strap that attaches between the occupant's helmet and the rod. The strap is connected to the helmet via attachments in the helmet and a cable assembly so as to allow the occupant's head to move freely from side to side.