The Jōban Line (Japanese: 常磐線, Hepburn: Jōban-sen) is a railway line in Japan operated by the East Japan Railway Company (JR East). The line officially begins at Nippori Station in Arakawa, Tokyo before the line officially ends at Iwanuma Station in Iwanuma, Miyagi. However, following the opening of the Ueno–Tokyo Line, Jōban Line train services originate at Shinagawa or Ueno; likewise, Jōban Line trains continue past Iwanuma onto the Tōhoku Main Line tracks to Sendai. The line approximately parallels the Pacific coasts of Chiba, Ibaraki, and Fukushima Prefectures.
The name "Jōban" is derived from the names of the former provinces of Jōshū (Japanese: 常陸), and Banshū (Japanese: 磐城), which are connected by the line to reach Tokyo.