Stacyville is a town in Penobscot County, Maine, United States, in the foothills of Mount Katahdin. The population was 380 at the 2020 census. It achieved national prominence in 1939 when 12-year-old Donn Fendler was lost on Katahdin for nine days, before being found in Stacyville on July 25, 1939. He was found by a searcher by the name of Nelson McMoran.