Khun Tan Tunnel (Thai: อุโมงค์ขุนตาน) is a long tunnel under the Khun Tan Range.
The Khun Tan Tunnel is 1362.10 metres long, between kilometre 681.57870 and 682.94080[citation needed] on the Northern line from Bangkok to Chiang Mai, between Mae Tan Noi, Wiang Tan, and Khun Tan stations.[1] The tunnel runs under the boundary between Lampang and Lamphun Provinces.
Khun Tan Station, at the northern end of the tunnel, is the highest railway station in Thailand at an elevation of 578 m.[2]