| Basa | |
| Also Known As: | Basa-Benue |
| Nativename: | ru-basa |
| States: | Nigeria |
| Region: | Benue River |
| Date: | 2020 |
| Ref: | e25 |
| Familycolor: | Niger-Congo |
| Fam2: | Atlantic–Congo |
| Fam3: | Benue–Congo |
| Fam4: | Kainji |
| Fam5: | Basa languages |
| Iso3: | bzw |
| Glotto: | basa1282 |
| Glottorefname: | Basa (Nigeria) |
| Dia1: | Basa-Kwomu (Basa-Komo) |
| Dia2: | Basa-Makurdi |
| Dia3: | Basa-Gurara |
| Dia4: | Basa-Kwali |
| Dia5: | Bassa Nge (Bassa Nupe) |
| Person: | bu-Basa |
| People: | a-Basa |
| Language: | ru-Basa |
| Root: | Basa[1] |
The Basa language, disambiguated as Basa-Benue, and also called Abacha, Abatsa, ru-Basa, Rubassa, is a Kainji language spoken in central Nigeria, in the vicinity of Bassa, Ankpa, Nasarawa, Gurara, Kwali and Makurdi. Blench (2008) notes that Basa-Makurdi, Basa-Gurara and Basa-Kwali are separate varieties from Basa-Kwomu or Basa-Komo of Bassa, Ankpa and Nasarawa Local Government Areas and other Bassa speakers are Bassa Nge (also known as Bassa Nupe.
Basa speakers also often speak the Igala language, the Ebira language or the Nupe language.