Trong Hieu Nguyen (; born 4 July 1992), known professionally as Trá»Âng Hiếu or (S)Trong (stylised in all caps), is a German singer of Vietnamese descent, best known for winning the sixth season of Vietnam Idol in 2015.
Trong Hieu Nguyen was born on 4 July 1992 in Bad Kissingen, Bavaria to Vietnamese parents who emigrated to Germany in 1991. He started dancing at the age of eight. After graduating from the Jack-Steinberger-Gymnasium in Bad Kissingen in 2011, he studied singing at the Music College Hannover in Hannover. He has cited Bruno Mars as one of his main artistic influences.
In 2008, Nguyen was a participant in the fifth season of , the German version of the Idol franchise. He made it to the top twenty-five, but was eliminated before the live shows. In 2014, he applied for , the German national selection for the Eurovision Song Contest 2015, but was not among the artists selected to compete.
While on vacation in Vietnam in April 2015, Nguyen decided to audition for the sixth season of Vietnam Idol. He went on to win the competition, receiving 71.5 per cent of the public vote in the final. He subsequently released the winner's single "", which was also released in German as "".
In 2020, Nguyen represented Vietnam at the Asia Song Festival. On 27 January 2023, he was announced as one of the participants in , the German national selection for the Eurovision Song Contest 2023. His entry "Dare to Be Different" was co-written with Norwegian singer-songwriter Elsie Bay and Dutch songwriters Sasha Rangas and Stefan van Leijsen. At , the song finished fourth out of eight entries with 71 points. He then re-established his music career in Vietnam, subsequently scoring his first hit there with "" in 2025.