Shimizu Tunnel (清水トンネル, Shimizu-tonneru) is a railroad tunnel in Gunma and Niigata Prefectures of Japan, operated by JR East Jōetsu Line.

The Shimizu tunnel is the oldest of the three, opened in 1931 after nine years of construction.

[1] Because of technical difficulties at the time, in addition to the main tunnel, two spiral tunnels were built along the mountain pass route, with a curve radius of 800 m.[2] The construction improved the journey time between Niigata and Tokyo, decreasing it by 4 hours since trains no longer needed to go through the Usui Pass.

The Shin-Shimizu Tunnel (新清水トンネル, Arashimizu ton'neru) was constructed in 1967 (mostly parallel to the Shimizu Tunnel) to enable conversion of the Joetsu Line from single track to double track, due to an increase in traffic volume on the Joetsu Line.

The Daishimizu Tunnel (大清水トンネル, Ōshimizu ton'neru) is a railway tunnel on the Jōetsu Shinkansen railway line on the border of Gunma Prefecture and Niigata Prefecture, Japan.