Yang Jun (楊俊) (571–600), nickname Azhi (阿祇), formally Prince Xiao of Qin (秦孝王), was an imperial prince of the Chinese dynasty Sui Dynasty. He was a son of Emperor Wen (Yang Jian) and his wife Empress Dugu Qieluo, who died as a result of an illness caused by poisoning by his jealous wife Princess Cui. His son Yang Hao was later briefly declared emperor by the general Yuwen Huaji after Yuwen killed his brother Emperor Yang in 618.