"Gas, gas, gas!", in military usage, a verbal warning of an imminent or occurring chemical weapon attack

Natural gas, a gaseous fossil fuel consisting primarily of methane

Gasoline, a refined fossil fuel

Gunner's Auxiliary Sight, a backup targeting system for the main gun of the M1 Abrams tank.

flatulence

Bristol Rovers FC, an English professional football team so nicknamed for their original proximity to a local gasworks

Liquefied Petroleum Gas (LPG), also called "cooking gas", which includes propane and butane

Nickelodeon Games and Sports for Kids, a U.S. cable television network

The Great American Songbook, a genre of American popular music

Streptococcus pyogenes, a bacterium commonly known as Group A Strep, or GAS

Gas, one of the phases of matter

Getaway Special, an experiment bay on the Space Shuttle

Autogas, a type of LPG used in motor vehicles

burping

bloating

Gas, Kansas, a town in the United States

The Children’s Global Assessment Scale, used by psychiatrists to assist with assessing children under 18

Gas, the moniker used by British electronic music artist Mat Jarvis

GAS, a Japanese Hardcore Punk band

Gas, an ambient music project by German producer Wolfgang Voigt

Gas-s-s-s, also called Gas! or It Became Necessary to Destroy the World in Order to Save It, a 1971 Roger Corman movie

Gas (comic), a British adult comic

The GNU Assembler

Galpin Auto Sports, a customising garage featured on the television show Pimp My Ride