Northern Colorado Regional Airport (IATA: FNL, ICAO: KFNL, FAA LID: FNL), formerly known as the Fort Collins–Loveland Municipal Airport, is a public use airport located nine nautical miles (10 mi, 17 km) southeast of the central business district of Fort Collins and northeast of Loveland, both cities in Larimer County, Colorado, United States.

The airport is situated west of Interstate 25 and Denver is located about 55 miles (89 km) south. It is most notable for serving the tourist areas of northern Colorado, such as the Rocky Mountain National Park, which is situated directly west of the airport. FNL primarily serves the Fort Collins–Loveland Metropolitan area located in Larimer County. The population for the metropolitan area is approximately 300,000.

Avelo Airlines launched service to both Burbank, California, and Las Vegas, Nevada, in October 2021, it was announced that they would cease all service at KFNL by June 24, 2022, via press release from the airport, citing increased fuel and supply prices for their exit.

As per Federal Aviation Administration records, the airport had 31,094 passenger boardings (enplanements) in calendar year 2008, 31,079 enplanements in 2009, and 35,671 in 2010 when Allegiant Air was providing scheduled service. It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a primary commercial service airport.