Increasingly since the 1990s, Latinx literature has represented the undocumented experience as fundamental to a larger history connecting the U.S. to Latin America and the Caribbean. Because the category of “illegality” is created and reified in large part by powerful stories about what it means to be “American,” the late 20th- and 21st centuries have given rise to a multitude of counter-narratives about migration and unauthorized status that critique and challenge these categorizations. The growing prominence of undocumented characters and of undocumented immigration in Latinx literature, particularly by authors who are not themselves undocumented, suggests that Latinx authors are coming to see the treatment of complicated immigration issues as integral to the ethical / social framework of their writing. This chapter covers fiction and non-fiction narratives chronicling migrant experience and border history, Central American migration in the wake of civil war and genocide, border crossing deaths and disappearances, as well as alternatives genres such as Magical Realism, humor, and the picaresque which also address the themes of migration and “illegality.”