Christopher Unborn (Spanish: Cristóbal Nonato) is the tenth novel by the Mexican author Carlos Fuentes.

The basic structure of the work, including the story of the character from conception to birth, comes directly from Laurence Sterne’s eighteenth century novel The Life and Opinions of Tristram Shandy, Gentleman (1759–1767), to which Fuentes refers openly in the novel.

It follows the character Christopher's entire life in a cataclysmic Mexico on the brink of economic collapse.

The lead character Christopher Palomar, a wonder boy with excellent language skills and total recall, is the narrator who travels through this pessimistic future, where the people still struggle since the last big earthquake in 1985.

The novel has a chapter for each of the nine described months of the story, spread out over Christopher's whole life, as he follows in his parents' steps, as they try to save themselves in a chaotic country entering into twilight.