Cadena 100 is a popular Spanish radio station based in Madrid that focuses on adult contemporary music. Launched on May 1, 1992, it is part of the COPE media group owned by the Spanish Episcopal Conference. The station's programming consists primarily of a mix of current hits and favorite songs from recent years, catering to listeners aged 25-55.

Cadena 100's flagship morning show "¡Buenos días, Javi y Mar!" hosted by Javi Nieves and Mar Amate, airs weekdays from 6:00 AM to 11:00 AM. Other notable programs include "Mateo & Andrea" in the afternoons and various music-focused shows throughout the day and night.

The station prides itself on offering "the best musical variety" and guarantees 45 minutes of uninterrupted music per hour. Cadena 100 can be heard via FM radio across Spain, as well as through digital platforms like DAB, DTT, and online streaming. As of 2024, it ranks as the second most listened to music radio station in Spain, with nearly 1.9 million daily listeners.