| Petalax | |
| Official Name: | Swedish: Petalax kommun Finnish: Petolahden kunta |
| Native Name: | Swedish: Petalax – Finnish: Petolahti |
| Settlement Type: | Town, former municipality |
| Mapsize: | 150px |
| Pushpin Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: | Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Ostrobothnia |
| Subdivision Type2: | Sub-region |
| Subdivision Name2: | Vaasa sub-region |
| Established Date: | 1926 |
| Extinct Title: | Consolidated |
| Extinct Date: | 1973 |
| Area Total Km2: | 117,5 |
| Population Total: | approx. 1200 |
| Population Density Km2: | auto |
| Demographics1 Info1: | % |
| Demographics1 Info2: | % |
| Demographics1 Info3: | % |
| Demographics1 Info4: | % |
| Demographics2 Title1: | 0 to 14 |
| Demographics2 Info1: | % |
| Demographics2 Title2: | 15 to 64 |
| Demographics2 Info2: | % |
| Demographics2 Title3: | 65 or older |
| Demographics2 Info3: | % |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
| Coordinates: | 62.8389°N 21.4231°W |
| Postal Code Type: | Postal code |
| Postal Code: | 66240 |
Petalax (fi|Petolahti) is a former municipality in Ostrobothnia.[1] The municipality was incorporated in Malax municipality in 1973.[2] Approximately 1,200 people live in Petalax and the main language is Swedish.