may refer to:
;Science
- Gas , one of the phases of matter
- Ideal Gas , in physics
- Various hydrocarbon gases used for heating, lighting, and energy transmission:
- --- Natural Gas
- --- Liquefied Petroleum Gas (), also called "cooking gas", including Propane and Butane
- ---Synthetic gases under the general name Syngas ; names include coal gas, water gas, illuminating gas, wood gas, producer gas, holzgas, air gas, blue gas, manufactured gas, town gas, and hygas.
- Gasoline (petrol), especially in North America
- Gas (chemical Warfare) , various poison gases used in warfare
- Gas Metal Arc Welding
- Laughing Gas , in anaesthesia, nitrous oxide
;Arts
;Acronym ''GAS''
- Getaway Special , an experiment bay on the Space Shuttle
- GNU Assembler , a computer language assembler
- Children’s Global Assessment Scale , used by psychiatrists to assist with assessing children under 18
- Gear Acquisition Syndrome, used by guitarists and amateur photographers amongst themselves to express their (somewhat compulsive) need for buying more gear
;Places
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