| Karijoki | |
| Official Name: | Finnish: Karijoen kunta Swedish: Bötoms kommun |
| Other Name: | Bötom |
| Settlement Type: | Municipality |
| Coordinates: | 62.3083°N 63.5°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | South Ostrobothnia |
| Subdivision Type2: | Sub-region |
| Subdivision Name2: | Suupohja sub-region |
| Leader Title: | Municipal manager |
| Leader Name: | Marko Keski-Sikkilä |
| Timezone: | EET |
| Utc Offset: | +02:00 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +03:00 |
| Website: | www.karijoki.fi |
Karijoki (in Finnish ˈkɑriˌjoki/; Swedish: Bötom) is a municipality of Finland. It is part of the South Ostrobothnia region. The population of Karijoki is, which makes it the smallest municipality in South Ostrobothnia in terms of population. The municipality covers an area of NaNKarijoki}} of which NaNKarijoki}} is inland water . The population density is NaNPD/km2NaNPD/km2. The municipality is unilingually Finnish.
A neanderthal cave, the Wolf cave, was found in the Pyhävuori mountains in Karijoki in 1997.