KOEL may refer to:

• KOEL (AM), a radio station (950 AM) licensed to Oelwein, Iowa, United States
• KOEL-FM, a radio station (98.5 FM) licensed to Cedar Falls, Iowa, United States

The true koels, Eudynamys, are a genus of cuckoos from Asia, Australia and the Pacific. They are large sexually dimorphic cuckoos which eat fruits and insects and have loud distinctive calls. They are brood parasites, laying their eggs in the nests of other species.