Hajjah Hetty Koes Endang (born 6 August 1957) is an Indonesian kroncong singer. Her 1977 duet with Ajie Bandi, "Damai Tapi Gersang" ("Peaceful Yet Arid"), was the first Indonesian song to win the World Popular Song Festival in Tokyo. The song was selected by Rolling Stone Indonesia in 2009 as one of the best Indonesian songs of all time.
Endang sings kroncong, a kind of traditional Indonesian music typified with slow, melancholic melodies and heavy use of string instruments. She has a high, shrill voice. In an interview with The Malay Mail she said that her works are most successful in Japan and the Netherlands.