Talapus Lake is a freshwater lake located on a prominent valley at the eastern skirt of Bandera Mountain, in King County, Washington. Mount Defiance and Pratt Mountain are a short distance to the west of Talapus Lake. The name Talapus is a Chinook word for coyote.
Talapus Lake is surrounded by other alpine lakes, including Olallie Lake and Pratt Lake a short distance north. Because of its proximity to Snoqualmie Pass and other prominent peaks in the Alpine Lakes Wilderness, the lake is a popular area for hiking, swimming, and fishing rainbow trout.
Access to the lake is from Talapus Lake trail or Pratt Lake trail further east, a short exit from Interstate 90, west of the Snoqualmie Pass.