| Nkayi | |
| Mapsize: | 350px |
| Subdivision Type: | Country |
| Subdivision Name: | Republic of the Congo |
| Subdivision Type1: | Region |
| Subdivision Name1: | Bouenza Region |
| Unit Pref: | Imperial |
| Area Total Km2: | 1,254 |
| Population As Of: | 2023 census |
| Population Footnotes: | [1] |
| Population Total: | 114,622 |
| Population Density Km2: | auto |
| Timezone: | GMT +1 |
| Utc Offset: | +1 |
Nkayi is a district in the Bouenza Region of southern Republic of the Congo. The capital lies at Nkayi.