| 1337 | Braddock Hills, Pennsylvania |
| 2007 in machinima | Braddock, Allegheny County, Pennsylvania |
| 2037 | Bradford Woods, Pennsylvania |
| Aleppo Township, Allegheny County, Pennsylvania | Brading |
| Alexander O. Smith | Bridgeville, Pennsylvania |
| Allegheny County, Pennsylvania | calculator spelling |
| argot | cant (language) |
| Aspinwall, Pennsylvania | Carnegie, Pennsylvania |
| Assize of Bread and Ale | Carnot-Moon, Pennsylvania |
| Avalon, Pennsylvania | Carpe Demon |
| b1ff | Castle Marrach |
| Back Orifice | Castle Shannon, Pennsylvania |
| Baldwin Township, Pennsylvania | Catherine Montaigne |
| Baldwin, Allegheny County, Pennsylvania | Cert-money |
| Bandy World Championship 2007 squad lists | Chalfant, Pennsylvania |
| Battle of Hlobane | Characters of Morrowind |
| BCET Gurdaspur | Charles C. Haight |
| Bell Acres, Pennsylvania | Charmed: Carpe Demon (TV episode) (2005 Fantasy TV Episode) |
| Bellevue, Allegheny County, Pennsylvania | Cheswick, Pennsylvania |
| Ben Avon Heights, Pennsylvania | chixor |
| Ben Avon, Allegheny County, Pennsylvania | Christina Balit (children's author/illustrator) |
| Ben X | Churchill, Pennsylvania |
| Bethel Park, Pennsylvania | Clairton, Pennsylvania |
| BFG9000 | ClueNet |
| Blawnox, Pennsylvania | code word (figure of speech) |
| Bob and George | Collier Township, Pennsylvania |
| Bobby Marsino | Compton (electoral district) |
| bolete; boletus (culinary) | Computer-mediated communication |
| BootVis | Coraopolis, Pennsylvania |
| Brackenridge, Pennsylvania | corruption (linguistics) |
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