PS

PS can refer to:


 * Harry Potter and the Philosopher's Stone, the first book in the series.
 * Harry Potter and the Philosopher's Stone (film), the film adaption of the first book.
 * Harry Potter and the Philosopher's Stone (video game), the video game adaption of the first book.
 * Harry Potter and the Philosopher's Stone (soundtrack), the songs of the first movie.
 * Philosopher's Stone, an object used in the first.