Horace Williams Airport (ICAO: KIGX, FAA LID: IGX) was a public use airport located one nautical mile (1.9 km; 1.2 mi) north of the central business district of Chapel Hill, a city in Orange County, North Carolina, United States. It was owned by the University of North Carolina at Chapel Hill.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Horace Williams Airport is assigned IGX by the FAA but has no designation from the IATA. The airport's ICAO identifier is KIGX.