PBW may refer to:
- Philadelphia-Baltimore-Washington Stock Exchange
- Peanut Butter Wolf, American hip hop record producer
- Proton beam writing, a lithography process
- Play by Web, Play-by-post role-playing game
- Prosopography of the Byzantine World, a prosopographical database project
- Poincaré-Birkhoff-Witt theorem, a result in mathematics
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