| Aisi | |
| Nativename: | Musak |
| States: | Papua New Guinea |
| Region: | Madang Province |
| Speakers: | 400 |
| Date: | 2015 |
| Ref: | e25 |
| Familycolor: | Papuan |
| Fam1: | Trans–New Guinea |
| Fam2: | Madang |
| Fam3: | Southern Adelbert |
| Fam4: | Sogeram |
| Fam5: | East |
| Iso3: | mmq |
| Glotto: | musa1266 |
| Glottorefname: | Aisi |
Aisi, or Musak, is a Papuan language of Madang Province, Papua New Guinea.
Aisi is spoken in Musak (-5.3359°N 145.2403°W), Kikerai (-5.2481°N 145.2107°W), Banam (-5.4138°N 145.2376°W), Sepu (-5.4588°N 145.2145°W), and Garaligut (-5.4736°N 145.2653°W) villages in Usino Rural LLG.[1] [2] The largest Aisi-speaking villages are Sepu, Banam, and Musak, located just to the east of the Ramu River.