Witham Field (IATA: SUA, ICAO: KSUA, FAA LID: SUA) is a public-use airport located 1 mile (1.6 km) southeast of the central business district of the city of Stuart in Martin County, Florida, United States.

[1] With the onset of World War II, private landowners offered their property to Martin County to build an airport.

Martin County's airport was originally known as MacArthur Field, however, it was later named Witham Field in honor of enlisted Naval Aviation Pilot First Class (AP1) Paul "Homer" Witham, who was the first Naval Aviator from the City of Stuart to die in World War II.

In October 1942, Martin County leased the 900-acre (3.6 km2) airport to the U.S. Government for use as a military training field.

In 1994, Northrop Grumman downsized their Witham Field operation and much of the property was again returned to Martin County, including responsibility for the airport's air traffic control tower.