The abbreviation PQ stands for:
- The Parti Québécois, a political party in Canada that advocates the independence of Quebec from Canada
- A former abbreviation for the province of Quebec, now replaced by the postal abbreviation " QC "
- A housing in the form of ICs, are in common use PQ144 PQ208 and
- The PQ formula for solving quadratic equations
- Pixelquelle, an image database for free and royalty-free photos
- The chemical compound plastoquinone