Dau or DAU may refer to:Club Deportivo Árabe Unido Daily active users, a performance metric for the success of an Internet product Dau (surname) Dau (film), a biography of physicist Lev Landau DAU (project), a cross-sectional cinema and art project Dau, a barangay in Mabalacat, Pampanga, Philippines Dauair, a small, short-lived German airline Da'u County, or Dawu County, in Sichuan, China Daru Airport, airport in Daru, Papua New Guinea Defense Acquisition University, a university under the United States Department of Defense located in Fort Belvoir, Virginia