Intertextuality is a literary device, characteristic especially for postmodern fiction, even though it was highly appreciated as early as the Classical Antiquity. It became more known in both poetry and prose in the second half of the 20th century, when theorists began to consider it for the first time as a part of literature studies and tried to define it. Since the postmodern wave also reached Spanish literature, which found itself in the process of rebirth after the fall of Francoism, I will discuss intertextuality in texts written by a Spanish postmodern author Javier Marías. Although his novels have clear connections with literature, film and art, it is the literary connection to Shakespeare%s works that stands out the most. This will be the main focus in my analysis of his three novels: Thus Bad Begins, Tomorrow in the Battle Think on Me and A Heart so White.