Big Lake is a census-designated place (CDP) in Skagit County, Washington, United States.

Big Lake is an exurban community in a fairly rural setting, although recent years have seen significant suburban development.

A few notable exceptions include a playable 9-hole golf course on the lake's east side, a 1950s-themed bar & grill, a quaint community store, and a small elementary school.

The latter two are located at the historic north end of the lake, once a bustling logging town.

A fire destroyed much of the town proper in the early 1900s, and that which was lost was never rebuilt.