Eau
Eau or EAU may refer to:
- The French word for water
- O (Cirque du Soleil), a water-themed stage production
 
 - Eau (trigraph), a trigraph of the Latin script
 - EAU, the IATA code for the Chippewa Valley Regional Airport in Wisconsin, United States
 - East Africa University, a private university in Puntland, Somalia
 - El Asher University, an undergraduate university in the Sharqia Governorate, Egypt
 - Emergency assessment unit (EAU), a short-stay department in a hospital
 - Estimated annual usage (EAU)
 - European Association of Urology, a non-profit organisation of urology professionals
 - Initiative: Eau, an American nonprofit, non-governmental organization
 - River Eau, a tributary of the River Trent in Lincolnshire, England
 - Uganda, license plate code