AASS or Aass may refer to:
Alpha-aminoadipic semialdehyde synthase American Anti-Slavery Society, abolitionist society in existence from 1833 to 1870 Aass Brewery, Norway's oldest active brewery Th. Valentin Aass (1887–1961), Norwegian sailor and civil servant Acta Sanctorum, a multi-volume work of critical hagiography
See also Aas (disambiguation)