| Kaba So | |
| Nativename: | Kulfa |
| States: | Chad |
| Date: | 1993 census |
| Ref: | e18 |
| Speakers2: | 4,030 Koulfa, 2,200 Kurumi, 910 Bara (1993 census) |
| Familycolor: | Nilo-Saharan |
| Fam2: | Central Sudanic |
| Fam3: | Bongo–Bagirmi |
| Fam4: | Kaba |
| Iso3: | kxj |
| Glotto: | kulf1238 |
| Glottorefname: | Kulfa |
| Dia1: | Bara |
| Dia2: | Kulfa |
| Dia3: | Kurumi |
Kaba So, also known as Kulfa after its primary dialect, is a Bongo–Bagirmi language of Chad. It is nearly intelligible with Kaba Na, which is used as a second language.