The O'Neill Municipal Airport (IATA: ONL, ICAO: KONL, FAA LID: ONL) (John L. Baker Field) is two miles northwest of O'Neill, in Holt County, Nebraska. It is owned by the O'Neill Airport Authority. The FAA's National Plan of Integrated Airport Systems for 2009–2013 categorized it as a general aviation facility.

The field is named after John L. Baker, a native of O'Neil who was a fighter pilot in the Korean War, the United States Department of Justice's first air-crash attorney, counsel to the United States Senate, and the Federal Aviation Administration as Assistant Systems Administrator for General Aviation.