Acid

;Ammunition
* Acid concentrate, an ammunition type in Fallout 4.
* Canisters of acid, an ammunition type in Fallout Tactics: Brotherhood of Steel.
;Weapons
* Acid Soaker, a weapon in the Fallout 4 add-on Nuka-World.
* Acid grenade, a thrown explosive in Fallout Tactics: Brotherhood of Steel.
* T86 acid sprayer, a trap found in Fallout Tactics: Brotherhood of Steel.
;Other
* LSD, a mentioned-only chem, mentioned in Fallout 2, Fallout: New Vegas, and Fallout 4.
* Hydrochloric acid, a quest item in Fallout 4.
* Acid (Fallout 4), a crafting component in Fallout 4.
* Acid (Fallout 76), a crafting component in Fallout 76.
* Bulk acid, a junk item in Fallout 76.
* Waste acid, a junk item in Fallout 76.