Jang Yoon-ju
- Birthday: 1980-11-07
- Place of birth: Seoul, South Korea
- Also know as: 张允珠
Jang Yoon-ju (Korean: 장윤주; 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.
