The Musashino (むさしの) is an all-stations train service in Japan operated by the East Japan Railway Company (JR East) in Tokyo between Hachiōji on the Chuo Line or Fuchū-Hommachi on the Musashino Line and Ōmiya in Saitama Prefecture.

[1] It avoids passengers having to change trains at Minami-Urawa or Musashi-Urawa to access the western portion of the Musashino line to/from Ōmiya.

Shimōsa is a similar service linking Ōmiya and the eastern side of the Musashino Line.

After passing Nishi-Urawa station, the train turns to Ōmiya arriving tracks.

The Musashino was formed in 2001 following the renaming of the earlier Rapid Shinkansen Relay.