AAB, AaB or Aab may refer to:
Aviation Abelag Aviation in Belgium Air Assault Badge, a US Army military badge Anti-aircraft battery, a weapons system component for anti-aircraft warfare Arrabury Airport in Queensland, Australia (IATA airport code AAB)
Companies and organizations Aalborg Boldspilklub, a sports club in Aalborg in Denmark AaB A/S, Aalborg Boldspilklub A/S, a Danish company ABN AMRO, the largest bank in the Netherlands Aboriginal Arts Board, an historical name for part of the Australian Council for the Arts Adyar Ananda Bhavan, a food business in India Akita Asahi Broadcasting, a television station in Akita Prefecture, Japan Arubaanse Atletiek Bond, the governing body for the sport of athletics in Aruba Athletics Association of Barbados, the governing body for the sport of athletics in Barbados Association of Applied Biologists, a UK-based learned society promoting applied biology
People Aab (surname) Alice Bailey, new age writer often referred to by her initials as AAB Akbar Al Baker, Qatar Airways CEO often referred to by his initials as AAB
Other uses .aab, the filename extension for Android App Bundles Alumu language, a Niger–Congo language of Nigeria (ISO 639-3 code "aab") Acetic acid bacteria, classified under alphaproteobacteria which are used in making vinegar Aniline Yellow or aminoazobenzene Bar form, a musical form of the pattern AAB Antigua and Barbuda, a Caribbean country