MDH may refer to:

Companies:

Mahashian Di Hatti, a spice company that sells under MDH brand
People:

Michael D. Higgins, ninth President 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
Government agencies:

Minnesota Department of Health
In other uses:

Month-Day-Hour, a six-digit code supplementing the VIN information to indicate the manufacturing time of a vehicle
multidimensional hierarchical toolkit
Homeopathic Medical Doctor, an alternative medical degree