| Uisai | |
| Region: | Bougainville |
| Speakers: | 2,500 |
| Date: | 1991 |
| Ref: | e18 |
| Familycolor: | Papuan |
| Fam1: | South Bougainville |
| Fam2: | Buinic |
| Fam3: | Buin |
| Iso3: | uis |
| Glotto: | uisa1238 |
| Glottorefname: | Uisai |
Uisai is a South Bougainville language of Bougainville Province, Papua New Guinea. It is in the Buin language subfamily.[1] The language uses Latin script.[2]