- Language: Iyasa
- Alternate names: Yasa, Iyassa, Yassa, Iyaasa, Maasa, Bongwe, "Ndowe"
- Language code: yko
- Language family: Niger-Congo, Atlantic-Congo, Volta-Congo, Benue-Congo, Bantoid, Southern, Narrow Bantu, Northwest, A, Bube-Benga (A.33) (SIL classification)
- Number of speakers: <3,000
- Vulnerability: Threatened
- Script: Latin script, used since 2011.
Christian, traditional religion.
May be mutually intelligible with Kombe [nui].