| Lehtimäki | |
| Official Name: | Finnish: Lehtimäen kunta Swedish: Lehtimäki kommun |
| Settlement Type: | Former municipality |
| Mapsize: | 150px |
| Pushpin Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: | Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Southern Ostrobothnia |
| Subdivision Type2: | Sub-region |
| Subdivision Name2: | Kuusiokunnat sub-region |
| Established Title: | Charter |
| Established Date: | 1866 |
| Extinct Title: | Consolidated |
| Extinct Date: | 2009 |
| Area Footnotes: | [1] |
| Area Total Km2: | 288.8 |
| Area Land Km2: | 271.84 |
| Area Water Km2: | 16.96 |
| Population As Of: | 31 December 2008 |
| Population Footnotes: | [2] |
| Population Total: | 1849 |
| Population Density Km2: | auto |
| Demographics1 Info1: | % (official) |
| 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: | 62.8181°N 23.9431°W |
| Postal Code Type: | Postal code |
Lehtimäki is a former municipality of Finland. It was consolidated to Alajärvi on 1 January 2009.
It is located in the province of Western Finland and is part of the Southern Ostrobothnia region. The municipality had a population of 1,850 (2006) and covered an area of 291.32 km² of which 18.88 km² is water. The population density was 7.2 inhabitants per km².
The municipality was unilingually Finnish.