Robertson Field (FAA LID: D55) is a public use airport located one nautical mile (2 km) west-southwest of the central business district of Langdon, a city in Cavalier County, North Dakota, United States.

[1] This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility.

[2] Robertson Field covers an area of 100 acres (40 ha) at an elevation of 1,608 feet (490 m) above mean sea level.

[1] For the 12-month period ending September 22, 2009, the airport had 3,750 aircraft operations, an average of 10 per day: 93.3% general aviation, 5.3% air taxi, and 1.3% military.

At that time there were 14 aircraft based at this airport, all single-engine.