Jang Yoon-ju (Hangul: 장윤주, born November 7, 1980) is a South Korean model and broadcaster. She is known for moderating both Korea's Next Top Model and MBC's Infinite Challenge's Calendar-making project.

In May 2011 Jang along with fashion models, Kim Jae-wook, Ji Hyun-jung, Han Hye-jin and Song Kyung-ah, co-authred a book titled Top Model. It is based on their experiences in the industry and includes beauty, makeup and styling tips. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.