Giftgas may refer to:
Giftgas (film) starring Gerhard Dammann Giftgas (record) on Throbbing Gristle discography Giftgas! the second full-length studio album by Canadian Holocaust denier national socialist black metal one-man band Blood Libel Giftgas, episode in List of Inspector Rex episodes#Season 5 A German word meaning "poison gas" Zyklon B gas used by Nazi Germany for extermination of Jews, featuring the warning "GIFTGAS!" prominently on its label A frequent mis-hearing for Giffgaff (a British mobile phone service), often in the recorded message "This is Giffgaff voicemail"