WSOY may refer to:
- Werner Söderström Osakeyhtiö, a Finnish publishing company founded in 1878, now part of Bonnier Group.
- WSOY (AM), a radio station (1340 AM) licensed to Decatur, Illinois, United States
- WSOY-FM, a radio station (102.9 FM) licensed to Decatur, Illinois, United States
WSOY (1340 kHz) is a commercial AM radio station broadcasting a news talk format. Licensed to Decatur, Illinois, the station is owned by Neuhoff Corp., through licensee Neuhoff Media Decatur, LLC. Neuhoff owns four other local radio stations, WCZQ, WDZ, WDZQ and WSOY-FM. Studios and offices are located on North Water Street and the transmitter is near St. Louis Bridge Road, sharing the same tower as WDZ. WSOY operates at 1000 watts, day and night.
The call letters "WSOY" refer to Decatur's nickname as "The Soy City," with soybeans a major agricultural crop in the region. The station is one of the oldest in Central Illinois, going on the air in 1925.