Zi Ning (紫宁), also known as Winnie, is a Chinese artist under Mavericks Entertainment. She is currently a member of the Chinese girl group MERA and a member of Produce 101 China project group Rocket Girls.
- Stage Name: Winnie, Zi Ning (紫宁)
- Birth Name: Zhang Zi Ning (张紫宁)
- Korean Name: Jang Ja Jeo (장자저)
- Birthdate: March 9, 1996
- Birthplace: Beijing, China
- Height: 165cm
- Weight: 45kg
- Education: Communication University of China
-  Produce 101 China
- She placed 7th on Produce 101 China with 107,630,613 votes.