JEF United Chiba
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| Full name | JEF United Ichihara Chiba | ||
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| Nicknames | JEF, Inu (The Dogs) | ||
| Founded | 1946 as Furukawa Electric SC | ||
| Stadium | Fukuda Denshi Arena Chiba | ||
| Capacity | 19,781 | ||
| Owner(s) | East Japan Railway Company (50%) Furukawa Electric (50%) | ||
| Chairman | Akira Shimada | ||
| Manager | Yoshiyuki Kobayashi | ||
| League | J1 League | ||
| 2026 | J1 League, 20th of 20 | ||
| Website | jefunited | ||
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JEF United Chiba (ジェフユナイテッド千葉, Jefu Yunaiteddo Chiba), full name JEF United Ichihara Chiba (ジェフユナイテッド市原・千葉, Jefu Yunaiteddo Ichihara Chiba), also known as JEF Chiba (ジェフ千葉, Jefu Chiba), is a Japanese professional football club based in Chiba, capital of Chiba Prefecture. They currently play in the J1 League, the top tier of the Japanese football league system, after promotion from the J2 League in 2025.