Mason Lake is a naturally occurring mountain lake located between Mount Defiance and Bandera Mountain near Snoqualmie Pass, King County, Washington.

[1] Accessible only by hike via the 3.4-mile-long (5.5 km) Mason Lake Trail (also known as "Ira Spring Memorial Trail"),[2] splits to Mount Defiance trail while continuing past the Island Lakes towards Pratt Lake trail at Olallie Lake's north shore.

Mason Lake is at an elevation of 4,200 feet (1,300 m)t.[3] This King County, Washington state location article is a stub.

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