AII

AII may refer to:


 * Agence de l'innovation industrielle (est. 2005) a French governmental agency which supports technological projects
 * Assyrian Neo-Aramaic (ISO 639-3 language code: aii)
 * Ali-Sabieh Airport (IATA airport code: AII; ICAO airport code: HDAS), Ali-Sabieh, Djibouti
 * Air Integra (ICAO airline code: AII), see List of airline codes (A)
 * Ajmer Junction railway station (rail code: AII), Jaipur Road, Patel Nagar, Topdara, Ajmer district, Rajasthan, India
 * Angiotensin II (angiotensin 2)
 * AII amacrine cells
 * American Idol (season 1), AI-I