Zhou Zhiruo (周芷若; Zhōu Zhǐruò) is one of the two female lead characters in the wuxia novel The Heaven Sword and Dragon Saber by Jin Yong.

The oath is as follows: I, Zhou Zhiruo, hereby swear to Heaven, that if I have any romantic feelings for the Demonic Cult's leader Zhang Wuji or if I marry him, my late parents' souls will not be at peace; my teacher Abbess Miejue will become a vengeful ghost after death and haunt me day and night, and should I have any offspring with Zhang Wuji, the males will become slaves while females will become prostitutes in every generation.

[2][3] Miejue names Zhou Zhiruo the new leader of Emei and tells her the secret behind the Heaven Reliant Sword and the Dragon Slaying Saber.

She tells Zhou Zhiruo to extract the martial arts manuals and the Book of Wumu concealed in the weapons' blades and master those skills, and use them to glorify Emei.

She pretends to marry Song Qingshu of the Wudang School, who has a crush on her, and passes him the Nine Yin Manual and tells him to learn the skills and use them to defeat Zhang Wuji.

Zhou Zhiruo feels guilty for her sins, especially when she encounters the "ghost" of Yin Li and admits to Zhang Wuji her past deeds and her love towards him.

Notable actresses who have portrayed Zhou Zhiruo in films and television series include Candice Yu (1978), Angie Chiu (1978), Sheren Tang (1986), Gigi Lai (1993), Kathy Chow (1994), Charmaine Sheh (2000), Gao Yuanyuan (2003), Liu Jing (2009) and Zhu Xudan (2019).