Wau may refer to :

Places and jurisdictionsWau, Papua New Guinea
Wau, South Sudan, city on the Jur River and Roman Catholic seeOtherWau (letter) or digamma, an obsolete Greek alphabet letter
Wau (surname), a surname
Wau, a fictional alien race in Tenchi Muyo
Wau bulan, a traditional kite in MalaysiaWAU is the abbreviation of:

Walkinshaw Andretti United, Australian motor racing team
Washington Adventist University, a private Seventh-day Adventist university
Weekly Active Users, a metric for the success of online social games and social networking services
Windows Anytime Upgrade, an upgrade method offered by Microsoft Corporation
WAU (WArden Unit), a fictional AI system appearing in Soma (video game)