Her Fearful Symmetry is a literary horror novel by American writer Audrey Niffenegger.
The book was published on 1 October 2009 and is set in London's Highgate Cemetery where, during research for the book, Niffenegger acted as a tour guide.
The novel's title is inspired by "The Tyger", a poem by the English poet William Blake, which begins "Tyger! Tyger! burning bright / In the forests of the night, / What immortal hand or eye / Could frame thy fearful symmetry?".
Considering the setting of the novel, some critics have also pointed out a potential verbal pun in the novel's title, since in received pronunciation "symmetry" and "cemetery" are almost homophonous. There is also a physical symmetry in two of the main characters - identical twins with mirrored internal organs.