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AHA or aha may refer to:

In arts and media[edit]



Other organizations[edit]

In science and technology[edit]

  • Alpha hydroxy acid, a class of chemical compounds that consist of a carboxylic acid substituted with a hydroxyl group on the adjacent carbon
  • Autoimmune hemolytic anemia, a condition in which antibodies attack a person's own red blood cells, leading to insufficient plasma concentration
  • Aha (wasp), a genus of Australian wasp
    • Aha ha, an Aha species abbreviated as A. ha

Other uses[edit]

See also[edit]