The Eunuch () is a 1971 Hong Kong wuxia film directed by Teddy Yip, starring Pai Ying and Lisa Chiao Chiao.
Gui Dehai is an influential court eunuch who holds sway over the imperial government. He causes the downfall of the Prince of Chu, a noble who opposes him, and attempts to have the prince's entire family exterminated too. Zhu Jin, the prince's son, survives with the help of an elderly couple and learns martial arts from them with the aim of avenging his family.
Before becoming a eunuch, Gui Dehai had fathered a daughter, Yanyan. After rising to power, he attempted to cover up his background by sending assassins to kill Yanyan and her mother. Yanyan is saved by the same elderly couple who rescued Zhu Jin. As they spend time together, Zhu Jin and Yanyan gradually fall in love with each other.
When Zhu Jin finally confronts Gui Dehai and learns the truth about Yanyan, her father attempts to turn her against Zhu Jin.