The Milchbuck Tunnel is a motor road tunnel in Switzerland, and forms part of the A1L motorway from Zürich Schwamendingen to Zürich Letten, where the tunnel's southern portal lies on Wasserwerkstrasse, which leads into central Zürich.

Constructed in 1978, the tunnel is 1,910 metres (6,270 ft) in length.

By 2006, the emergency services in the tunnel have been upgraded, with the escape path being added.

At the northern portal in the direction to the city, the entrance to the Irchel underground car park is to the left of the lane.

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