Kanmon Tunnel may refer to:
- Kanmon Railway Tunnel, undersea rail tunnel connecting the islands of Honshu and Kyushu
- Kanmon Roadway Tunnel, undersea road tunnel connecting Shimonoseki, Yamaguchi and Moji-ku, Kitakyūshū
- Kanmon Roadway Tunnel § Pedestrian Tunnel, undersea pedestrian tunnel underneath the Kanmon Roadway Tunnel
- Shin-Kanmon Tunnel, undersea rail tunnel connecting Shin-Shimonoseki Station and Kokura Station
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