This is a list of Railway Electrification Systems in Japan: Overhead line power supply, unless otherwise noted. The rail system consists of the following (As of 2005^[update]):^[1]

• 20,264 km (12,591 mi) of 1,067 mm (3 ft 6 in), of which 13,280 kilometres (8,250 mi) is electrified;
• 3,204 km (1,991 mi) of 1,435 mm (4 ft 8+1⁄2 in) standard gauge, all electrified;
• 117 km (73 mi) of 1,372 mm (4 ft 6 in) Scotch gauge, all electrified;
• 11 km (6.8 mi) of 762 mm (2 ft 6 in) narrow gauge, all electrified.

This article may require cleanup to meet Wikipedia's quality standards. The specific problem is: standardizing to be table lists, also some new informations on abandoned sections and to be electrified sections. (October 2022)

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Electrification systems used by the Japan Railways Group, Japan's formerly state-owned operators, are 1,500 V DC and 20 kV AC for conventional lines and mini Shinkansen and 25 kV AC for Shinkansen. Electrification at 600 V DC and 750 V DC are also seen in private lines and non-rail based transit systems. The frequency of the AC power supply is 50 Hz in Eastern Japan and 60 Hz in Western Japan.