MDH may refer to:
- Michael D. Higgins, President-elect of Ireland
In official codes:
- Minimum Descent Height for aircraft landing
- MDH, the IATA airport code and FAA location identifier for Southern Illinois Airport
Places:
- Mälardalen University or Mälardalens högskola (MdH) in Sweden
- The Million Dollar Hotel, an English movie. Several tracks in the movie's soundtrack are ascribed to "The MDH Band"
- Milton District Hospital in Milton, Ontario, Canada
In science:
- MDH, in enzymology, abbreviation for malate dehydrogenase
- MDH is also an abbreviation for Methylenedioxyhydroxyamphetamine
In other uses:
- Mahashian Di Hatti, an Indian spice manufacturing company, sells under MDH brand
- multidimensional hierarchical toolkit
- Homeopathic Medical Doctor, an alternative medical degree