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Ferula assa-foetida gum oleoresin (FAGO) is traditionally used for treatment of different ailments. The subject of this article was to evaluate the chemical composition and antibacterial effects of the different types of bitter FAGO essential oils in the natural habitat of Southwest Iran. α-pinene (38.2%), and ( Z )-propenyl sec-butyl disulfide (12.4%) were the main components of F. assa-foetida tear type essential oil, with high antibacterial, anti-biofilm and cytotoxic activities, followed by paste and mass types, respectively. α-pinene (27.8%), and ( Z )-propenyl-sec-butyl disulfide (24.2%) were identified as main components of paste type. α-pinene (33.4%), β-pinene (16.3%), and ( Z )-propenyl sec-butyl disulfide (16.1%) were the main components of asafoetida mass type gum oleoresin essential oil. FAGO essential oil specially tear one could serve as suitable candidate for further studies.