| Masimasi | |
| States: | Indonesia |
| Region: | Papua |
| Speakers: | 10 |
| Date: | 2005 |
| Ref: | e18 |
| Familycolor: | Austronesian |
| Fam2: | Malayo-Polynesian |
| Fam3: | Oceanic |
| Fam4: | Western Oceanic |
| Fam5: | North New Guinea |
| Fam6: | Sarmi – Jayapura Bay |
| Fam7: | Sarmi |
| Iso3: | ism |
| Glotto: | masi1265 |
| Glottorefname: | Masimasi |
Masimasi is a nearly extinct Austronesian language spoken on an offshore island of Papua, Indonesia.