Tan Duc Thanh Nguyen (; 30 October 1983 – 9 May 2018) was a Vietnamese–Australian citizen. He was convicted in Indonesia for drug trafficking as a member of the Bali Nine. In 2005, Nguyen was arrested in a room at the Melasti Hotel in Kuta together with three others. Police uncovered of heroin in a suitcase in the room. After a criminal trial, on 15 February 2006 Nguyen was sentenced to life imprisonment. His appeal to the Indonesian Supreme Court to have the sentence reduced suffered a shock when the Supreme Court imposed the death penalty on 6 September 2006.