Hsu Nien-tzu
- Birthday: 2003-06-02
- Place of birth: Taipei, Taiwan
- Also know as: 許念慈
Nien (Hangul: 니엔; Mandarin: 念) is a Taiwanese-Vietnamese idol under MODHAUS and the thirteenth revealed member of tripleS. She was revealed as S13 on March 20, 2023.
