|Locale||Tochigi, Ibaraki prefectures|
|Rolling stock||E501 series/E531 series EMUs|
|Opened||16 January 1889|
|Line length||50.2 km (31.2 mi)|
|Track gauge||1,067 mm (3 ft 6 in)|
|Electrification||20 kV, 50 Hz AC (overhead catenary)|
The Mito Line (水戸線, Mito-sen) is a railway line connecting Oyama Station in Tochigi Prefecture and Tomobe Station in Ibaraki Prefecture, Japan. The line is 50.2 km (31.2 mi) long and is owned and operated by the East Japan Railway Company (JR East).
Joban Line E501 series and E531 series ten car sets continue on to Iwaki, Fukushima while the 5 car sets go to Oyama. They separate at Tomobe.
|Oyama||小山||-||0.0||Tōhoku Shinkansen, Tōhoku Main Line (Utsunomiya Line), Ryōmō Line||∨||Oyama||Tochigi|
|Shimodate||下館||3.7||16.2||Mooka Railway Mooka Line
|Tomobe||友部||1.7||50.2||Jōban Line (some through services for Mito)||◇|
A 5-car E501 series EMU on the Mito Line in December 2008
A 5-car E531 series EMU on the Mito Line in March 2015
A 4-car 415-1500 series EMU on the Mito Line in March 2016
The Mito Railway Co. opened the line on 16 January 1889 operating between Oyama and Mito Stations. On 1 March 1892, the Mito Railway Co. merged with the Nippon Railway.
On 1 July 1895, the Joban Line was opened by the Nippon Railway, joining the Mito Line at Tomobe Station. The company was nationalised in 1906.
On 12 October 1909, the Japanese Government Railways renamed the Tomobe to Mito section as part of the Joban Line, resulting in the current "Mito Line" being the section between Oyama and Tomobe.
The line was completely electrified on 1 February 1967.
Kasama Station: A 1.4 km 610 mm (2 ft) gauge handcar line to the Kasama Inari shrine operated between 1915 and 1930.