| Mamusi | |
| States: | Papua New Guinea |
| Region: | East New Britain Province |
| Speakers: | 6,000 |
| Date: | 1985 |
| Ref: | e18 |
| Familycolor: | Austronesian |
| Fam2: | Malayo-Polynesian |
| Fam3: | Oceanic |
| Fam4: | Western Oceanic |
| Fam5: | Ngero–Vitiaz |
| Fam6: | Mengen |
| Iso3: | kdf |
| Glotto: | mamu1254 |
| Glottorefname: | Mamusi |
| Dia1: | Mamusi |
| Dia2: | Melkoi (Kakuna) |
Mamusi is an Austronesian language of East New Britain Province in Papua New Guinea.