Rocky Mountain Metropolitan Airport (IATA: BJC, ICAO: KBJC, FAA LID: BJC) is a public-use airport located in Broomfield, Colorado, United States. The airport is owned and operated by Jefferson County and is situated midway between Denver and Boulder on U.S. Highway 36. It is located 16 miles (26 km) northwest of the central business district of Denver, and is the closest airport to downtown Denver. The airport covers 1,700 acres (688 ha) and has three runways. Formerly known as Jefferson County Airport or Jeffco Airport, the airport was renamed Rocky Mountain Metropolitan Airport on October 10, 2006, although it is sometimes referred to as Rocky Mountain Regional Airport, e.g., on 2007–2012 county planning documents.

This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorizes it as a reliever airport. It is home to a large general aviation population including a fair amount of corporate traffic and several flight schools. The airport's proximity to the nearby Interlocken business district contributes to its business traveler clientele. It has a control tower on 118.6 (local) and 121.7 (ground) that is open from 0600 to 2200 local time. ATIS/AWOS broadcasts on 126.25.