Seikani tunnel (jaapani keeles 青函トンネル Seikan tonneru või 青函隧道 Seikan zuidō) on Jaapanis Honshū ja Hokkaidō saart ühendav raudteetunnel.
Tunneli kogupikkus on 53,85 kilomeetrit, millest 23,3 km kulgeb mere all.
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