| This is an overview article, listing content appearing in multiple Fallout media. For information specific to a given game or TV series, consult the table below. |
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Intelligence is one of seven primary statistics in the SPECIAL system.
Fallout, Fallout 2 and Fallout Tactics[]

Modifies: Skill Rate, Available dialogue options, Skill levels
Fallout 3[]

Modifies: Medicine + Repair + Science skill level, Skill Rate.
Fallout: New Vegas[]

Modifies: Medicine + Repair + Science skill levels, Skill Rate.
Fallout 4[]

Modifies: Number of Experience Points gained from all sources
Fallout 76[]

Modifies: Experience Points yield, Scrapping yield, Item condition and durability, Ability to hack terminals + number of duds when hacking terminals
Fallout Shelter[]
Intelligence affects how efficient a dweller is while working in the medbay and science lab facilities. A dweller's Intelligence can be increased by assigning them to the classroom.
Fallout: The Board Game[]
Unlike other games, Intelligence is not treated as a variable ranging from 1 to 10, but instead as a token that can be obtained at the start or when leveling up. A player character with the Intelligence token gets free rerolls during certain tests, as well as during fights if equipped with an Intelligence-based weapon. They can also recruit certain companions from the shop.
The Brotherhood Outcast player character always begins the game with Intelligence. Any player character wearing the lab coat gains one hit during an Intelligence test. During any Intelligence test, Mentats can be used to gain one free hit.
Intelligence-based perks[]
Intelligence-based weapons[]
Companions requiring Intelligence[]
Low Intelligence characters[]
In almost all of the games in the Fallout series, setting the player character's intelligence to a very low level will result in the player character having the mentality of a very young child. This results in some quite humorous differences when talking to NPCs: Dialogue options will generally be childish and immature, frequently marred with grammatical and spelling errors, an inability to understand basic concepts, non-sequiturs, caveman-like speech, and baby talk. NPC reactions to the player character's unintelligence can vary from taking pity on them to outright mocking them.
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