| Buyu | |
| States: | Democratic Republic of the Congo |
| Region: | South Kivu–Katanga |
| Speakers: | 10,000 |
| Date: | 2002 |
| Ref: | e18 |
| Familycolor: | Niger-Congo |
| Fam2: | Atlantic–Congo |
| Fam3: | Benue–Congo |
| Fam4: | Bantoid |
| Fam5: | Bantu (Zone D) |
| Fam6: | Nyanga–Buyi |
| Iso3: | byi |
| Glotto: | buyu1239 |
| Glottorefname: | Buyu |
| Guthrie: | D.55 |
Buyu, or Buyi, is a Bantu language of Lake Tanganyika that is closely related to Nyanga.
A "Bemba" language of South Kivu was listed in Ethnologue 17 as ISO code [bmy]. However, the name, Kinyabemba, is the language of the Banyabemba, one of the tribes that speak Buyu. (It is not the Bemba language of Zambia.) "Songa" [sgo] is another Buyu-speaking tribe rather than a distinct language. "Buya" [byy] is unidentified, but may be a typo for Buyu. The codes were retired in 2014.