Jonas David Kröper (born 25 August 1990), also known by his stage name Jonasu, is a German DJ and music producer based in Berlin. His single "Black Magic" charted in the top 5 in the UK and Ireland in July 2021.

Born in Mannheim, he attended the Johann Sebastian Bach Gymnasium before studying jazz drums at the Conservatory of Amsterdam.

In 2020, Jonasu received two Buma Awards for co-writing the song "Post Malone" by Sam Feldt featuring Rani. He produced the 2020 single "Pon It" by New Zealand rapper JessB. After being used in an episode of British dating game show Love Island in June 2021, his 2020 single "Black Magic" registered a 59% increase in daily Spotify streams and entered the top 40 of the UK Singles Chart.