| Official Name: | Nässjö |
| Pushpin Map: | Sweden Jönköping#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Nässjö Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Jönköping County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Småland |
| Area Footnotes: | [1] |
| Area Total Km2: | 11.44 |
| Population As Of: | 31 December 2010 |
| Population Total: | 16,678 |
| Population Density Km2: | 1458 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 57.65°N 55°W |
Nässjö (in Swedish pronounced as /ˈnɛ̂ɧːœ/)[2] is a locality and the seat of Nässjö Municipality, Jönköping County, Sweden with 31,782 inhabitants in 2024.
For many years, Nässjö was a rural village with agriculture as the dominant occupation. The turning point was the construction of the Swedish railway system. The southern main line railway, finished in 1864, passed through Nässjö. Later, other railways were inaugurated, whereby Nässjö, due to its geographical location in the country, became an important junction. A line to Katrineholm was opened in 1874, and that year also the opening of the Oskarshamn line; the one to Halmstad in 1882; to Kalmar in 1914. Today, Nässjö is the only Swedish junction where railways in six different directions meet.
As a result, industries moved to Nässjö, and the population increased. The most important industries were wood industries due to the forest covered Småland province area, at a time when it had become possible to factory manufacture the wooden chair (a.k.a. Windsor chair). Nässjö attempted to get a charter, which was granted in 1914, making it one of the now defunct Cities of Sweden. It is since 1971 instead the seat of the much larger Nässjö Municipality.
Its population continued to increase throughout the 20th century. In the 1940s production of electrical installation equipment began, and the industry Eldon AB was for a long time the largest industry of the town.
The rock band Backyard Babies and metal band Kongh hail from Nässjö. The head of the largest ponzi scheme in the Nordic countries, Winclub/Wincapita, Mr Hannu Kailajärvi was arrested in Nässjö on December 10, 2008, after reportedly having lived there for some time.
Nässjö Motorstadion is a motorcycle speedway and flat track speedway venue located on the south west edge of the locality on Skogsvallen.[3] [4] The stadium hosts the NK Nässjö speedway team[5] that has competed in the Swedish Speedway Team Championship and won the second division in 1997.[6] The facility has hosted important events, including qualifying rounds of the Speedway World Championship in 1983, 1986 and 1991.[7] [8]