The Prince and the Showgirl is a 1957 British romantic comedy film starring Marilyn Monroe and Laurence Olivier, who also served as director and producer. The screenplay written by Terence Rattigan was based on his 1953 stage play The Sleeping Prince. The Prince and the Showgirl was filmed at Pinewood Studios in Buckinghamshire.

The Sleeping Prince: An Occasional Fairy Tale is a 1953 play by Terence Rattigan, conceived to coincide with the coronation of Elizabeth II in the same year. Set in London in 1911, it tells the story of Mary Morgan, a young actress, who meets and ultimately captivates Prince Charles of Carpathia, considered to be inspired by Carol II of Romania.