Gas Light (known in the US as Angel Street) is a 1938 play by the British dramatist Patrick Hamilton. The play (and its film adaptations) gave rise to the term gaslighting with the meaning "a form of psychological abuse in which false information is presented to the victim with the intent of making him/her doubt his/her own memory and perception".

"Gaslamp" and "Gas light" redirect here; for other uses, see Gaslamp (disambiguation) or Gas light (disambiguation). For the psychological manipulation technique, see Gaslighting.

Gas lighting is production of artificial light from combustion of a gaseous fuel, such as hydrogen, methane, carbon monoxide, propane, butane, acetylene, ethylene, or natural gas.