Grass Koiari language
| Grass Koiari | |
|---|---|
| Region | Papua New Guinea | 
| Ethnicity | Koiari people | 
| Native speakers | (1,700 cited 2000) | 
| Trans–New Guinea
 
 | |
| Language codes | |
| ISO 639-3 | kbk | 
| Glottolog | gras1249 | 
| ELP | Grass Koiari | 
| Grass Koiari is classified as Vulnerable by the UNESCO Atlas of the World's Languages in Danger | |
Grass Koiari (Koiali) is a Papuan language of Papua New Guinea spoken in the inland Port Moresby area. It is not very close to the other language which shares its name, Mountain Koiali. It is considered a threatened language.
Most speakers are located in the north-eastern portion of Port Moresby, others present in the headwaters of Hunter River and Musgrave River as well as in the Motu villages of Tubuseleia, Barakau, and Gaile.