| Koiwat | |
| States: | Papua New Guinea |
| Region: | East Sepik Province |
| Speakers: | 800 |
| Date: | 2000 census |
| Ref: | e25 |
| Familycolor: | Papuan |
| Fam1: | Sepik |
| Fam2: | Middle Sepik |
| Fam3: | Ndu |
| Iso3: | kxt |
| Glotto: | koiw1243 |
| Glottorefname: | Koiwat |
Koiwat is one of the Ndu languages of Sepik River region of northern Papua New Guinea.
It is spoken in Kamangaui (-4.1164°N 143.5935°W), Koiwat (-4.0898°N 143.5552°W), Paiambit (-4.1107°N 143.6962°W), and Seraba (-4.064°N 143.6291°W) villages of Koiwat ward, Angoram/Middle Sepik Rural LLG, East Sepik Province.[1]