PW
- pW – (s) picowatt
- PW
- (s) Palau (postal symbol; ISO 3166 digram)
- petawatt
- PWA – (i) Pirates With Attitude
- PWBA – (p) Pension and Welfare Benefits Administration
- PwC – (i) PricewaterhouseCoopers (international accounting firm)
- PWC – (i) PieceWise Constant (describing a mathematical function)
- PWL – (i) PieceWise Linear (describing a mathematical function)
- PWLC – (i) PieceWise Linear and Concave/Convex (describing a mathematical function)
- PWP – (i) Plot, What Plot? / Porn Without Plot (denotes plotless, um, "feel-good" stories in online fiction, especially fanfic or erotic fiction)
- PWR – (i) Pressurized Water Reactor
- PWV – (i) Pretoria-Witwatersrand-Vereeniging, the original name for the South African province now known as Gauteng, and still used to refer to the metropolitan agglomeration at the core of the province
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