Iguaçu or Iguazú may refer to:
Inhabited places
- Puerto Iguazú, Argentina
- Foz do Iguaçu, Paraná, Brazil
- Nova Iguaçu, Rio de Janeiro, Brazil
- Nova Iguaçu de Goiás, Goiás, Brazil
- Iguaçu Territory, a former Brazilian federal territory
- Iguaçu state, a proposed Brazilian state
Rivers
- Iguazu River, a river in Brazil and Argentina
- Iguazu Falls, on the Iguazu River
Other uses
- Iguaçu, a 1977 album by Passport
- 1684 Iguassú, a main belt asteroid
- Iguaçu National Park (Brazil)
- Iguazú National Park (Argentina)