Heat-Ray (disambiguation)
In science fiction, the Heat-Ray is a weapon used by the Martians in H. G. Wells' The War of the Worlds and its offshoots. Heat-Ray may also refer to:

Active Denial System, also known as "heat ray", a non-lethal, directed-energy weapon
Archimedes' heat ray
Godzilla's atomic heat beam
A weapon in the science fiction/adventure novel Danny Dunn and the Heat Ray

See also
 Thermal radiation, electromagnetic radiation generated by the thermal motion of particles in matter