A novel method for synthesizing 3‐arylselanyl benzothiophenes through visible‐light‐mediated radical cyclization was developed. Diaryl selenides were used as aryl selenium sources under the irradiation of white‐light‐emitting diodes (5 W). The reactions were conducted under mild conditions, where the desired products were obtained at room temperature (23 °C) without the need for catalysts or additives. This simple method allows for an efficient route for synthesizing benzothiophene derivatives, which are crucial scaffolds in organic synthesis.