| Sammatti | |
| Official Name: | Finnish: Sammatin kunta Swedish: Sammatti kommun |
| Settlement Type: | Former municipality |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: | Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Uusimaa |
| Subdivision Type2: | Sub-region |
| Subdivision Name2: | Helsinki sub-region (formerly Lohja sub-region) |
| Extinct Title: | Consolidated with Lohja |
| Extinct Date: | 2009 |
| Area Footnotes: | [1] |
| Area Total Km2: | 85.06 |
| Area Land Km2: | 72.01 |
| Area Water Km2: | 13.05 |
| Population As Of: | 2008-12-31 |
| Population Footnotes: | [2] |
| Population Total: | 1365 |
| Population Density Km2: | auto |
| Demographics1 Footnotes: | [3] |
| Demographics Type2: | Population by age |
| Demographics2 Footnotes: | [4] |
| Demographics2 Title1: | 0 to 14 |
| Demographics2 Info1: | 18.8% |
| Demographics2 Title2: | 15 to 64 |
| Demographics2 Info2: | 65.1% |
| Demographics2 Title3: | 65 or older |
| Demographics2 Info3: | 16.0% |
| Blank1 Name: | Climate |
| Blank1 Info: | Dfb |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
| Coordinates: | 60.3208°N 23.8208°W |
Sammatti (in Finnish pronounced as /ˈsɑmːɑtːi/) is a former municipality of Finland. It was consolidated with the city of Lohja in the beginning of 2009.
It is located in the province of Southern Finland and is part of the Uusimaa region. The municipality had a population of 1,365 (31 December 2008) and covered a land area of . The population density was .
The municipality is unilingually Finnish.
It was the birthplace of one of Finland's most famous writers, Elias Lönnrot, the compiler of the Kalevala.[5]
Prior to its consolidation into Lohja in 2009, Sammatti contained of the following villages: