| Ntomba | |
| Also Known As: | Bolia, Lia |
| Region: | Lake Tumba, Lake Mai-Ndombe |
| States: | Democratic Republic of the Congo |
| Speakers: | 100,000 Ntomba |
| Date: | 1980 |
| Speakers2: | 100,000 Lia (2000) |
| Ref: | e18 |
| Familycolor: | Niger-Congo |
| Fam2: | Atlantic–Congo |
| Fam3: | Benue–Congo |
| Fam4: | Bantoid |
| Fam5: | Bantu (Zone C) |
| Fam6: | Bangi–Ntomba (C.30) |
| Fam7: | Mongo |
| Lc1: | nto |
| Ld1: | Ntomba |
| Lc2: | bli |
| Ld2: | Bolia |
| Glotto: | boli1263 |
| Glottorefname: | Bolia–Ntomba |
| Guthrie: | C.35 |
Ntomba and Lia (Bolia) are closely related Bantu languages of the Democratic Republic of the Congo, close enough to be considered dialects of a single Lia-Ntomba language.
The related Mongo language also has varieties called Ntomba or Ntumba.