Bug

* Items:
** Bug (item), a quest item in Fallout.
** NCR bug, a quest item in Fallout: New Vegas.
** Bug-on-the-shell, a consumable in Fallout Tactics.
** Boom bug, a thrown explosive in Fallout Tactics.
* Other:
** Bug Stomper, a challenge perk in Fallout: New Vegas. 
** Quarantine the Glow Bugs, a quest in Van Buren.
Bug may also refer to in-game software malfunctions:
* Fallout bugs
* Fallout 2 bugs
* Fallout 3 bugs
** Operation: Anchorage bugs
** The Pitt bugs
** Broken Steel bugs
** Point Lookout bugs
** Mothership Zeta bugs
* Fallout: New Vegas bugs
** Dead Money bugs
** Honest Hearts bugs
** Old World Blues bugs
* Fallout 4 bugs
** Far Harbor bugs
** Nuka-World bugs
* Fallout 76 bugs