PDH or PdH may refer to:
- Angiotensin-converting enzyme, an enzyme
- Plesiochronous digital hierarchy, in telecommunications networks
- Pound–Drever–Hall technique for stabilizing a laser's output
- Pyranose dehydrogenase (acceptor), an enzyme
- Pyruvate dehydrogenase, an enzyme
- Party of Humanists (German : Partei der Humanisten), a political party in Germany
This disambiguation page lists articles associated with the title PDH.
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