Jang Yoon-ju (born November 7, 1980) is a South Korean model, television personality, singer-songwriter and actress.
Yoon-ju began modeling in 1997 when she was 17 years old, and became one of the most successful Korean fashion models, with a career spanning almost two decades.
She also hosts Korea's Next Top Model, and won Best Radio DJ at the 2013 KBS Entertainment Awards for KBS Cool FM's Rooftop Radio.
As a singer-songwriter, Jang has released two albums, Dream (2008) and I'm Fine (2012).
She made her acting debut in 2015, playing a detective in Ryoo Seung-wan's crime thriller Veteran.