Gaslight may mean:
- Cthulhu by Gaslight, First Edition (supplement for the Gaslight Setting)
- Cthulhu by Gaslight, Second Edition (supplement for the Gaslight Setting)
- Cthulhu by Gaslight, Third Edition (supplement for the Gaslight Setting)
- Gaslight, a wiki resource page for the general setting; see also Weird West, a wiki resource page for a differently-themed general setting in roughly the same era
- Gaslight (1944 film) or the lesser-known Gaslight (1940 film), film versions of a famous play about a woman whose husband slowly manipulates her into believing that she is going insane, lending popular culture the term "gaslighting" to describe this sort of manipulation
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