The Itsukaichi Line (五日市線, Itsukaichi-sen) is a railway line operated by East Japan Railway Company (JR East) in Tokyo, Japan.

From there, some trains travel through to Tachikawa Station via the Ōme Line, and select weekend/holiday services (branded as Holiday Rapid Akigawa) continue from Tachikawa along the Chūō Line to Tokyo Station.

Until 18 March 2023, Holiday Rapid Akigawa services ran on weekends on this line.

At the same time, the section of the line between Tachikawa and Haijima was deemed non-essential and closed.

However, the Tachikawa - Musashi-Uenohara and Musahi-Uenohara - Nishi-Tachikawa sections of the former Nambu Railway are still used by Chūō Main Line and Nambu Line trains traveling to and from the southern area of Tachikawa Station.