| Usan | |
| Nativename: | Wanuma |
| States: | Papua New Guinea |
| Region: | Madang Province |
| Speakers: | 1,400 |
| Date: | 1991 |
| Ref: | e18 |
| Familycolor: | Papuan |
| Fam1: | Trans–New Guinea? |
| Fam2: | Madang |
| Fam3: | Croisilles |
| Fam4: | Numugen |
| Iso3: | wnu |
| Glotto: | usan1239 |
| Glottorefname: | Usan |
Usan, or Wanuma, is a Papuan language of Papua New Guinea.[1]