<!--thumb|250px|Cascade Tunnel eastern portal-->
The Cascade Tunnel refers to two railroad tunnels, its original tunnel and its replacement, in the northwest United States, east of the Seattle metropolitan area in the Cascade Range of Washington, at Stevens Pass. It is approximately east of Everett, with both portals adjacent to Both single-track tunnels were constructed by the Great Northern Railway.
The first was in length and opened in 1900 to avoid problems caused by heavy winter snowfalls on the original line that had eight zig zags (switchbacks). The current tunnel is <!--41,183 feet--> in length and entered service in early