AAH or Aah may refer to:
- AAH, Arlington Academy of Hope, a non-profit organization that helps Ugandan children reach their full potential
- Iah, an ancient Egyptian god of the moon
- AAH, IATA airport code for Merzbrück Airport near Aachen, Germany
- AAH, ICAO airline code for Aloha Airlines of the United States
- Action Against Hunger, an international aid effort aimed at alleviating malnutrition in children
- Advanced Attack Helicopter, a 1970s US Army program to develop a new attack helicopter
- African Americans for Humanism, a program of the Council for Secular Humanism
- The Association of Art Historians, learned society for art historical study in the UK, and publisher of the journal Art History
- Anne Arbor Huron High School, another name for Huron High School (Ann Arbor, Michigan)
- Aquatic ape hypothesis, a theory from evolutionary biology that human ancestors at some point lived partially in water
- The Australian Academy of the Humanities, an institution dedicated towards advancing Australian scholarship in the humanities
- Asa'ib Ahl al-Haq, an Iraqi Shi'a insurgent group
- Aah, 1953 Hindi film starring Raj Kapoor and Nargis