Jorge Luis Borges (1899-1986) was one of the great writers of the twentieth century and the most influential author in the Spanish language of modern times. He had a seminal influence on Latin American literature and a lasting impact on literary fiction in many other languages. However, Borges has been accessible in English only through a number of anthologies drawn mainly from his work of the 1940s and 1950s. The primary aim of this Companion is to provide a more comprehensive account of Borges's oeuvre and the evolution of his writing. It offers critical assessments by leading scholars of the poetry of his youth and the later poetry and fiction, as well as of the 'canonical' volumes of the middle years. Other chapters focus on key themes and interests, and on his influence in literary theory and translation studies.