KDEC (1240 kHz) is a commercial AM radio station broadcasting in Decorah, Iowa.
KDEC broadcasts on a frequency shared with local non-commercial college radio station KWLC.
In 1926, Decorah's first radio station started broadcasting from the south end of the second floor of the Ben Bear building, with Charles Greenley the announcer.
He was put in charge of the new radio station, known by the call letters KGCA.
On September 30, 2019, KDEC changed their format from oldies to a simulcast of adult contemporary-formatted KMRV 1160 AM Waukon.