Duan Sui (Chinese: 段隨; died 386) was a monarch of the Xianbei-led Chinese Western Yan dynasty.
He was a general under the emperor Murong Chong, whose people wanted to return east to their homeland but who, after capturing the Former Qin capital Chang'an, wanted to settle in Chang'an, against the wishes of his people.
In spring 386, the general Han Yan (韓延) assassinated Murong Chong in a coup and supported Duan Sui as the Prince of Yan.
About a month later, however, the officials Murong Heng (慕容恆) and Murong Yong ambushed Duan Sui and killed him.
They supported Murong Yi, the son of the Former Yan Prince of Yidu Murong Huan (慕容桓) as the new Prince of Yan.