The Keio Inokashira Line (京王井の頭線, Keiō Inokashira-sen) is a railway line operated by the Japanese private railway operator Keio Corporation in the western suburbs of Tokyo, connecting Shibuya in Tokyo with Kichijōji in Musashino City.

It is not physically connected to the Keio Main Line Network, but a transfer is available at Meidaimae Station.

The track gauge used was the same 1,067 mm (3 ft 6 in) as for other Odakyu lines, and the overhead power supply was 600 V DC.

[2] After World War II, Greater Tokyu was divided, and the Inokashira Line came under Keio ownership.

From 25 February 1969, following the voltage being increased to 1500 V DC, air-conditioned trains were introduced on the Inokashira Line.