Lake County Airport (IATA: LXV, ICAO: KLXV, FAA LID: LXV), also known as Leadville Airport, is a county-owned public-use airport located two nautical miles (3.7 km) southwest of the central business district of Leadville, a city in Lake County, Colorado, United States.

According to the FAA's National Plan of Integrated Airport Systems for 2009–2013, it is categorized as a general aviation airport.

At an elevation of 9,927 ft (3,026 m) above mean sea level the airport claims the distinction of being North America's highest. Pilots receive a free certificate commemorating their landing upon a successful landing. Aircraft performance deteriorates rapidly with altitude, so many organizations use the Leadville Airport as a base for high-altitude performance testing.

Lake County Airport covers an area of 605 acres (245 ha). It has one asphalt paved runway designated 16/34 which measures 6,400 by 75 feet (1,951 x 23 m). It also has one helipad designated H1 with a concrete surface measuring 150 by 100 feet (46 x 30 m).

For the 12-month period ending December 31, 2008, the airport had 10,000 aircraft operations, an average of 27 per day: 78% general aviation, 20% military, and 2% air taxi. At that time there were 11 aircraft based at this airport, all single-engine.

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