MADD

MADD or Madd may refer to:
 * Mothers Against Drunk Driving, a nonprofit organization in the United States and Canada that seeks to stop driving with any amount of alcohol in the bloodstream
 * Myoadenylate deaminase deficiency or Adenosine monophosphate deaminase deficiency type 1, a metabolic disorder
 * Multiple acyl-CoA dehydrogenase deficiency, another name for the genetic disorder Glutaric acidemia type 2
 * MADD (gene) or MAP kinase-activating death domain protein
 * Madd, the fruit of Saba senegalensis
 * Maladaptive Daydreaming Disorder (written MaDD)
 * Mixed anxiety–depressive disorder, a psychological disorder