| Ulau | |
| Also Known As: | Suain |
| Region: | Sandaun Province, Papua New Guinea |
| Speakers: | 2,800 |
| Date: | 2003 |
| Ref: | e18 |
| Familycolor: | Austronesian |
| Fam2: | Malayo-Polynesian |
| Fam3: | Oceanic |
| Fam4: | Western |
| Fam5: | Schouten |
| Fam6: | Siau |
| Iso3: | svb |
| Glotto: | ulau1237 |
| Glottorefname: | Ulau-Suain |
Ulau-Suain is an Austronesian language of coastal Sandaun Province, Papua New Guinea. It is spoken in Ulau 1 (-3.3027°N 142.7946°W), Ulau 2 (-3.3133°N 142.8211°W), and Suain (-3.3369°N 142.9199°W) wards of East Aitape Rural LLG, Sandaun Province.