Mu Nianci is a character in the wuxia novel The Legend of the Condor Heroes by Jin Yong (Louis Cha).

Qin Nanqin becomes pregnant and gives birth to Yang Guo and thereafter becomes a nun and travels with Mu Nianci before settling down to raise her child.

After Yang Kang was poisoned, Mu Nianci performs a coup de grâce on him and commits suicide to join him in death.

A young Jurchen prince, Wanyan Kang, joins the contest out of mischief and defeats Mu Nianci easily.

Before dying, Yang Tiexin learns that the young man who stood up for him earlier is his late sworn brother's son.

Mu Nianci attempts to kill Wanyan Honglie to avenge her foster father but Yang Kang intervenes and stops her.

Yang Kang reveals his treacherous nature and collaborates with the Jurchens to exploit his own race while lying to Mu Nianci that he has changed.

Mu Nianci discovers Yang Kang's villainous deeds eventually and decides to leave him for good.

Following his mother's instructions before her demise, Yang Guo had her remains cremated and buried at the Temple of the Iron Spear, in the hope of reuniting her with his father in death.

When she was 13, Mu Nianci learnt the Carefree Fist (逍遙遊; xiāoyáo yoú) from Hong Qigong in a ruined temple in Xinyang.

[3] Notable actresses who have portrayed Mu Nianci in films and television series include Kara Hui (1977–1978), Sharon Yeung (1983), Emily Kwan (1994), Jiang Qinqin (2003), Liu Shishi (2008), Zhao Liying (2014), Meng Ziyi (2017) and Huang Yi (2024).