| Bahau | |
| Also Known As: | Kajan |
| States: | Indonesia |
| Region: | Borneo |
| Ethnicity: | Bahau people |
| Speakers: | 19,000 |
| Date: | 2007 |
| Ref: | e18 |
| Familycolor: | Austronesian |
| Fam2: | Malayo-Polynesian |
| Fam3: | Greater North Borneo ? |
| Fam4: | Kayanic |
| Fam5: | Kayan–Murik |
| Fam6: | Kayan |
| Iso3: | bhv |
| Glotto: | baha1257 |
| Glottorefname: | Bahau |
Bahau (Kajan) is a Kayanic language of Borneo.