Original: The original Spanish title refers to the mythological fauns of Roman mythology, while the English title refers specifically to the faun-like Greek character Pan (as do the titles used in other languages, including German, Pans Labyrinth and French, Le Labyrinthe de Pan).
Simplified: The original Spanish title refers to the mythological fauns of Greek mythology, while the English title refers specifically to the faun-like Greek god Pan (intended to help English-speakers differentiate the title from the term fawn).