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.

Bug may also refer to in-game software malfunctions:
 * Other:
 * Bug Stomper, a challenge perk in Fallout: New Vegas.
 * Quarantine the Glow Bugs, a quest in Van Buren.