MDU

The initials MDU may refer to:


 * Mains distribution unit, electrical device
 * Maharishi Dayanand University in Rohtak, Haryana, India
 * Manchester Debating Union
 * McGill Debating Union, a student-run debating society at McGill University.
 * Medical Defence Union, medical defence organisation providing legal support should its members' clinical competence be questioned
 * Methylene diurea, a chemical compound
 * Military Democratic Union (Unión Militar Democrática), clandestine Spanish organisation of military officers in the late- and post-Franco era.
 * MingDao University, a university in Changhua County, Taiwan
 * MDU Resources (Montana-Dakota Utilities), American diversified energy company
 * Multi-dwelling unit, classification of housing
 * MDU, IATA airport code of Mendi Airport in Papua New Guinea
 * MDU, Indian Railways station code of Madurai Junction railway station in Tamil Nadu, India