PDH

PDH or PdH may refer to:

Angiotensin-converting enzyme, an enzyme Palacio de Hierro, luxury department store 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 (), a political party in Germany