Denys Ivanov (Ukrainian: Денис Іванов; born 1976), known by his stage name DJ Amadeus is a Ukrainian-born American DJ and music producer.

Born in Kharkiv, he emigrated to the United States with his parents in 1989, when he was 13 years old. The son of two professional singers, he was placed in music school at an early age, studying piano before becoming interested in DJing in the '90s. After DJing in various venues, he became the resident DJ at Tunnel in 1998. In 2000, DJ Amadeus produced his first original track, “The Arrival”, on Jonathan Peters’ Deeper Records NYC. He followed this up with Let's Bounce, on Flash Traxx in 2002. In 2002, he also became a resident DJ of the Imagine Party at the Carbon/Mirage nightclub, which would later be renamed Exit. In subsequent years, he was the resident DJ for the M2 and the Pink Elephant, and in 2011, he was the resident at Skyroom.
Currently DJ Amadeus is releasing his own music and touring, with his two latest tracks, Must Be That Look and Goes Around, released on Germany's Tiger Records.