Iowa County Airport (ICAO: KMRJ, FAA LID: MRJ) is a county-owned public-use airport located three nautical miles (6 km) northwest of the central business district of Mineral Point, a city in Iowa County, Wisconsin, United States. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2021–2025, in which it is categorized as a local general aviation facility.

Although many U.S. airports use the same three-letter location identifier for the FAA and IATA, this facility is assigned MRJ by the FAA but has no designation from the IATA (which assigned MRJ to Marcala Airport in Marcala, Honduras).