| Duau | |
| States: | Papua New Guinea |
| Region: | Milne Bay Province |
| Speakers: | 5,000 |
| Date: | 2004 |
| Ref: | e25 |
| Familycolor: | Austronesian |
| Fam2: | Malayo-Polynesian |
| Fam3: | Oceanic |
| Fam4: | Western Oceanic |
| Fam5: | Papuan Tip |
| Fam6: | Nuclear Papuan Tip |
| Fam7: | North Papuan Mainland – D'Entrecasteaux |
| Fam8: | Dobu–Duau |
| Dia1: | Dawada |
| Dia2: | Guleguleu |
| Dia3: | Mwalukwasia |
| Dia4: | Siausi |
| Dia5: | Somwadina |
| Iso3: | dva |
| Glotto: | duau1237 |
| Glottorefname: | Duau |
Duau is a dialectically diverse Austronesian language spoken in the D'Entrecasteaux Islands of Papua New Guinea. It is spoken in Duau Rural LLG.