Wiscasset Municipal Airport (IATA: ISS, ICAO: KIWI, FAA LID: IWI) is a public-use airport located three miles (5 km) southwest of the central business district of Wiscasset, a town in Lincoln County, Maine, United States.

This general aviation airport is publicly owned by Town of Wiscasset.

[1] As of 2007[update] it is not served by commercial aircraft, though scheduled air service was once available on Downeast Airlines.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Wiscasset Airport is assigned IWI by the FAA and ISS by the IATA.

[3] On April 27, 2020, the FAA announced an award of $3.2 million to repave runway 7/25.