| Siikajoki | |
| Official Name: | Finnish: Siikajoen kunta Swedish: Siikajoki kommun |
| Settlement Type: | Municipality |
| Coordinates: | 64.6667°N 31°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | North Ostrobothnia |
| Subdivision Type2: | Sub-region |
| Subdivision Name2: | Raahe |
| Seat: | Ruukki |
| Leader Title: | Municipality manager |
| Leader Name: | Kaisu Tuomi |
| Established Title: | Charter |
| Established Date: | 1868 |
| Timezone: | EET |
| Utc Offset: | +02:00 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +03:00 |
Siikajoki is a municipality of Finland. It is part of the North Ostrobothnia region. The municipality has a population of and covers an area of NaNSiikajoki}} ofwhich NaNSiikajoki}}is water. The population density isNaNSiikajoki. Neighbour municipalities are Hailuoto, Liminka, Lumijoki, Raahe and Siikalatva.
The municipality is unilingually Finnish.
The current municipality of Siikajoki consists of three previous municipalities of Paavola and Revonlahti, that were merged into the municipality of Ruukki in 1973, and the municipality of Siikajoki founded in 1868. The municipalities of Ruukki and Siikajoki were disbanded and replaced by the new municipality of Siikajoki on January 1, 2007.