János Koós (born Kupsa; 20 November 1937 – 2 March 2019) was a Hungarian pop singer. He became successful in the 1960s after participation in the talent show Táncdalfesztivál. Koós was born in Bucharest, Romania. He played for the Wind Band of the National Tax and Customs Administration between 1957 and 1960. He started his solo singer career in 1960, performing the schlagers of Vico Torriani. He adopted the Koós stage name by that time.