Olallie Lake is a freshwater lake located on a prominent valley at the western base of Pratt Mountain, between Mount Defiance and Bandera Mountain,[2] in King County, Washington.

[3] The name means berry in Chinook Jargon.

Because of its proximity to Snoqualmie Pass and other prominent peaks in the Alpine Lakes Wilderness,[4] the lakes are a popular area for hiking, swimming, and fishing rainbow trout.

[5] Access to Olallie Lakes is through Mount Defiance Trail 1009, which is an offshoot of Pratt Lake Trail 1007.

[7] Access is also from Talapus Lake trail or Pratt Lake trail further east, a short exit from Interstate 90, west of the Snoqualmie Pass.