Ontonagon County Airport, also known as Schuster Field, is a county-owned public-use airport located 3 miles (5 km) west of the central business district of Ontonagon, Michigan, a village in Ontonagon County, Michigan, United States. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2021–2025, in which it is categorized as a basic general aviation facility.