Willmar Municipal Airport (IATA: ILL, ICAO: KBDH, FAA LID: BDH), also known as John L. Rice Field, is a city-owned public-use airport located west of the central business district of Willmar, a city in Kandiyohi County, Minnesota, United States. The airport opened in 2006 and is located two miles west of a closed airport which operated under the same name (IATA: ILL, ICAO: KILL, FAA LID: ILL).

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Willmar Municipal Airport is assigned BDH by the FAA and ILL by IATA; BDH is used by the IATA for Bandar Lengeh Airport in Bandar Lengeh, Iran.