Bill

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 * Bill (Fallout), a guard for the Friendly Lending Company in the Hub, unused $$
 * Bill (Broken Hills), the caravan master of Broken Hills in Fallout 2.
 * Bill (New Reno), a patron at Salvatore's Bar in New Reno $$
 * Bill (Vault 15), one of the Vault 15 Squatters $$
 * Bill Foster, an inhabitant of Vault 112, trapped in the Tranquility Lane simulation in Fallout 3.
 * Bill Wilson, a resident of Andale inn Fallout 3.
 * Bill Seward, a runaway slave residing in the Temple of the Union $$
 * Bill (Fallout 3), leader of Billsylvania mentioned $$
 * Wild Bill, a dead Pitt slave in the Fallout 3 add-on The Pitt.
 * Note from Wild Bill, a paper note in the Fallout 3 add-on The Pitt.
 * Wild Bill's Last Stand, an unmarked quest in the Fallout 3 add-on The Pitt.
 * Wild Bill's Sidearm, a unique .32 Pistol in the Fallout 3 add-on The Pitt.
 * Bill (The Pitt), an employee of the Pittsburgh Department of Public Works before the Great War, mentioned in the Fallout 3 add-on The Pitt.
 * Bill Ronte, an engineer turned drunkard living in Freeside $$
 * Squatter Bill, an NCR squatter living in North Vegas Square $$
 * Bill Levy, a janitor at the REPCONN Test Site before the Great War, mentioned $$
 * Bill Martin, a custodian at the REPCONN test site before the Great War, mentioned $$
 * Bill the tax collector, a character placeholder used to narrate the ending sections of the game in the Fallout: New Vegas add-on Lonesome Road.
 * Bill Calhoun, a member of the Followers of the Apocalypse, mentioned in Fallout: New Vegas and its add-on Honest Hearts.
 * Bill (Dead Money), Sheila's boyfriend at the Sierra Madre Casino, mentioned in the Fallout: New Vegas add-on Dead Money.
 * Bill Sutton, a farmer at the Warwick homestead in Fallout 4.
 * Bill Madison, a man intended for residence in Vault 114, mentioned $$
 * Bill Stevens, an employee of federal surveillance center K-21B before the Great War, mentioned $$
 * Bill (Berkeley Springs), a resident of Berkeley Springs before the Great War, mentioned in Fallout 76.
 * Bill (Gourmands), a member of the Gourmands, mentioned $$
 * Bill (Morgantown), a student at Vault-Tec University before the Great War, mentioned $$
 * Bill Garrahan, the eldest son of Vivian Garrahan, mentioned $$
 * Bill White, a guest at the Whitespring Resort, mentioned $$
 * Bill Thomas, the owner of the Thomas farm before the Great War, mentioned in the Fallout 76 update Wild Appalachia.
 * Bill Menoutis, a clown that resided in Vault 51, mentioned in the Fallout 76 update Nuclear Winter.
 * Bill (Wastelanders), a member of the Blood Eagles mentioned in the Fallout 76 update Wastelanders.
 * Bill (unused), an associate of Eddie, mentioned in Fallout 76 unused content.
 * Bill of Rights, a pre-War document and quest item found in the National Archives $$
 * Bill of sale, a paper note $$
 * Bill's letter, a paper note $$

Meta

 * Bill Field, a developer who worked at Interplay Entertainment as a tester of the PC version on Fallout.
 * Bill Delk, a developer who worked at Interplay Entertainment as a technician on Fallout, Fallout 2 and Fallout Tactics.
 * Bill Stoudt, a developer who worked at Interplay Entertainment in video services on Fallout 2, as the director of rich media on Fallout Tactics and credited with special thanks on Fallout: Brotherhood of Steel.
 * Bill Holmes, an actor who voiced AJ and Edward Deegan in Fallout 4 and male Blood Eagles in the Fallout 76 update Wastelanders, as well as Brotherhood Barnaby in Steel Dawn.
 * Bill Lobley, an actor who voiced various characters in the Fallout 76 updates Wastelanders and Steel Dawn.
 * Bill Farmer, a voice actor and comedian who voiced characters for Fallout Tactics.