Danielson Airport (ICAO: KLZD, FAA LID: LZD, formerly 5B3) is a state-owned public-use airport located two nautical miles (4 km) northwest of the central business district of Danielson, a borough in the town of Killingly in Windham County, Connecticut, United States. It is the smallest airport in the state to be included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a local general aviation facility.