The Tōbu Tōjō Line (東武東上線, Tōbu Tōjō-sen^?) is a 75.0 km suburban railway line in Japan which runs from Ikebukuro Station in Toshima, Tokyo to Yorii Station in Yorii, Saitama, operated by the Tobu Railway. Its official name is the Tōbu Tōjō Main Line (東武東上本線, Tōbu Tōjō Honsen^?), but it is referred to as Tōbu Tōjō Line (東武東上線, Tōbu Tōjō Sen^?) on Tobu signage and publicity information.

The Tōjō Line and Tōbu Ogose Line branch are isolated from other Tobu lines, such as the Isesaki Line and Nikkō Line. There was a plan to connect between Nishiarai on the Isesaki Line and Kami-Itabashi on the Tōjō Line, but this was never built.

The name of the line comes from the original plan to construct a line linking Tokyo (東京^?) with Jōshū (上州^?) (an old province now Gunma Prefecture).

Abbreviations:

Tobu 8000 series

Tobu 9000 series

Tobu 10000 series

Tobu 10030 series

Tobu 30000 series

Tobu 50000 series

Tobu 50090 series

Tokyo Metro 7000 series

Tokyo Metro 10000 series

Preserved 7300 series

Tokyo Metro 07 series

On 1 May 1914, the Tōjō Railway (東上鉄道, Tōjō Tetsudō^?) began operating, covering the 33.5 km stretch between Ikebukuro and Tanomosawa (located between the present stations of Kawagoeshi and Kasumigaseki). Two years later, the line was extended 9.2 km from Kawagoemachi (now Kawagoeshi) to Sakadomachi (now Sakado), and at the same time, the section between Kawagoemachi and Tanomosawa was abandoned.