Crown Prince Yukou (Chinese: 禦寇; pinyin: Yùkòu; died 672 BC) was the original heir apparent of Duke Xuan of Chen, the sixteenth ruler of the ancient Chinese state of Chen during the Spring and Autumn period. In 672 BC, the 21st year of his reign, Duke Xuan's favourite concubine gave birth to a son named Kuan. Duke Xuan killed Yukou and made Kuan his new heir apparent. Duke Xuan died in 648 BC after 45 years of reign, and Prince Kuan ascended the throne, to be posthumously known as Duke Mu of Chen.