Madb or MADB can refer to:
Mythology Medb, an Irish legendary figure in Proto-Indo-European religion, also called Queen Maeve
Science and medicine madB, a protein-encoding gene in Phycomyces blakesleeanus Mandibuloacral dysplasia with type B lipodystrophy, a type of Laminopathy Carboxybiotin decarboxylase, an enzyme
Acronyms Myanma Agricultural Development Bank Minor actinide property database Integrated Nuclear Fuel Cycle Information System#Modules Magyar agár database Microarray database Message Addressing Database, for WS-Addressing Material Acquisition Database