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PDH may refer to:

  • Angiotensin-converting enzyme, an enzyme
  • Plesiochronous digital hierarchy, a technology used in telecommunications networks
  • Pound–Drever–Hall technique, a widely used and powerful approach for stabilizing the frequency (or wavelength) of light emitted by a laser
  • Professional Development Hours, a measure of continuing professional development for licensed professionals
  • Pyranose dehydrogenase (acceptor), an enzyme
  • Pyruvate dehydrogenase, the first component enzyme of pyruvate dehydrogenase complex