Auca or AUCA may refer to :

• Auca (titular diocese), the former Catholic bishopric of (Villafranca Montes de) Oca in Spain, now a Latin titular see
• A pejorative name for the native Huaorani people in Ecuador
  • Operation Auca, an endeavor to evangelize the Huaorani tribe
• Auca (genus), a genus of butterflies in the subfamily Satyrinae of the family Nymphalidae
• Auca (cartoon), a Catalan genre of story in pictures
• Sociedad Deportiva Aucas, a football club from Quito, Ecuador

AUCA as an acronym

• Adventist University of Central Africa
• American University of Central Asia