Zaiyi (Manchu: ᡯᠠᡳᡳ; Dzai-i; 26 August 1856 – 24 November 1922), better known by his title Prince Duan (or Prince Tuan), was a Manchu prince and statesman of the late Qing dynasty. He is best known as one of the leaders of the Boxer Rebellion of 1899–1901.

Zaiyi was born in the Aisin Gioro clan as the second son of Yicong (Prince Dun), the fifth son of the Daoguang Emperor. His family was under the Bordered White Banner of the Eight Banners. He was adopted by his father's cousin, Yizhi (奕誌; 1827–1850), who had no son to inherit his Prince Rui peerage. In 1861, Zaiyi was made a beile, before succeeding Yizhi as a junwang (second-rank prince) under the title "Prince Duan of the Second Rank" (端郡王) in 1894.

Prince Duan sided with Empress Dowager Cixi and opposed the Hundred Days' Reform movement initiated by the Guangxu Emperor and his allies. After the reformist movement was crushed, in 1899, Empress Dowager Cixi designated Prince Duan's son, Puzhuan (溥儁; 1875–1920), as First Prince (大阿哥) in her plan to depose the Guangxu Emperor and replace him with Puzhuan. However, since the ambassadors of other countries did not recognise Puzhuan's legitimacy, the empress dowager was forced to abandon her plan.

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