The Heat-Ray is a fictional weapon used by the Martians in the novel The War of the Worlds.
Heat-Ray may also refer to:
Active Denial System, also known as the "heat ray", a non-lethal directed-energy weapon Archimedes' heat ray Godzilla's atomic heat beam A fictional weapon in the novel Danny Dunn and the Heat Ray
See also Thermal radiation, electromagnetic radiation emitted by the thermal motion of particles in matter