Lake County Executive Airport (IATA: LNN, ICAO: KLNN, FAA LID: LNN), formerly Lost Nation Airport, is a public use airport in Lake County, Ohio, United States. Located approximately 3 miles (5 km) north-northeast of the central business district of the City of Willoughby, it was owned and operated by that city until October 8, 2014, when it was transferred to Lake County and the Lake County Port and Economic Development Authority. The airport's name was changed from Lost Nation Airport to Lake County Executive Airport, alternately "Lake County Executive Airport at Lost Nation Field," in March 2020.

This airport was included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation reliever airport for Cleveland Hopkins International Airport.