Who Is Sylvia? is a 1950 comedy play by the British writer Terence Rattigan about a man obsessed with the image of a woman he met as a seventeen year old and his search for her throughout the rest of his life. The play offered a thinly veiled portrayal of Rattigan's own philandering father.[1] Like Perchance to Dream, Ivor Novello's long-running musical terminating only two years previously, Rattigan chose a line from William Shakespeare for his title. The line is the first wistful question of a song passage in The Two Gentlemen of Verona.[2]