Hidden Falls is an archaeological site that contains evidence for the earliest occupation in Southern Alaska along with evidence of marine resource usage. It is dated to the Archaic and Pacific period, between 9,500 and 1800 B.C.

Hidden Falls is located at an elevation of 39 meters or 128 feet, south of Kelp Bay on Baranof Island, opposite Sitka, in Alaska. The site was first discovered by the U.S. Forest Service personnel with initial excavations occurring in 1978. Radiocarbon dating was conducted and demonstrated that people were living in Hidden Falls 10,000 years ago. There is evidence that the occupants of Hidden Falls produced stone tools that were associated with marine resources; the occupants relied on the ocean for their subsistence and transportation. This site also produced evidence of different types of stone tools, which were categorized into three components, some of these included microblades and cobblestone tools.