Zhu Xinyuan (Chinese: 祝惺元; pinyin: Zhù Xīngyuán; Wade–Giles: Chu Hsing-yüan; born 1880) was a politician and diplomat in the Republic of China. He was an important politician during the Provisional Government of the Republic of China and the Wang Jingwei regime. His courtesy name was Yanxi (硯溪). He was born in Daxing, Zhili (now Beijing).