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.

Joban Line E501 series and E531 series ten car sets continue on to Iwaki, Fukushima while the 5 car sets go to Oyama.

[citation needed] 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.

[citation needed] The line was completely electrified on 1 February 1967.

[citation needed] Kasama Station: A 1.4 km 610 mm (2 ft) gauge handcar line to the Kasama Inari shrine operated between 1915 and 1930.