| Nguyen Thanh Hien | |
| Alias: | Hien, Hyenn |
| Birth Name: | Nguyễn Thanh Hiền |
| Birth Date: | 6 March 1994 |
| Birth Place: | Budapest, Hungary |
| Instruments: | Vocals, piano, violin |
| Genre: | R&B, pop music |
| Occupations: | Singer, musician, entertainer, dancer, model, pianist, fiddler |
| Years Active: | 2008–present |
| Label: | Tom-Tom Records |
| Associated Acts: | SP |
Nguyễn Thanh Hiền or simply Hien (born 6 March 1994) is a Hungarian pop singer of Vietnamese descent who competed in the Hungarian Megasztár sixth season and was the fifth runner up.
Hien attended school between 2000 and 2006 at Sopron's at the Lackner Kristóf Elementary School, where besides traditional subjects she studied the violin, piano and singing lessons. Between 2006 and 2009, she was a student in the Sopron's Széchenyi István Secondary School. After her family moved to Budapest, she attended the Trefort Ágoston Secondary School.
Hien appeared during 2008 in the TV2 musical talent the show of Megasztár, where she advanced to 6th place.
In the Megasztár finals she appeared in the following productions:
After that talent show Hien signed on to Tom-Tom Records.
Her greatest success was English-language song, "Not Livin' in Yesterday". It was presented for the first time in 2011 in Berlin, Germany.