| Official Name: | Järna |
| Pushpin Map: | Sweden Stockholm#Sweden#European Union |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Södertälje Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Stockholm County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Södermanland |
| Area Footnotes: | [1] |
| Area Total Km2: | 3.93 |
| Population As Of: | 31 December 2020 |
| Population Footnotes: | [2] |
| Population Total: | 6,153 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 59.0833°N 51°W |
Järna is a locality situated in Södertälje Municipality, Stockholm County, Sweden with 6,377 inhabitants in 2010.
Järna has long been the centre of the anthroposophical movement in Sweden, and there is a private clinic, several schools and other institutions affiliated with the movement. A lot of the buildings, in the nearby village of Ytterjärna, are designed by the Danish-born anthroposophical architect Erik Asmussen (1913–1998), including the Cultural Centre in Ytterjärna, which in 2001 was voted the second best-liked modern building in Sweden.
Beata Bergström, photographer, resided here.[3]