Belle de Jour may refer to:

• Belle de jour (film)
• Belle de jour, the novel on which the film is based
• Belle de Jour (writer), a pen name of Dr Brooke Magnanti
• Belle de Jour (character), a character in the television series Secret Diary of a Call Girl, also known as Hannah Baxter
• Secret Diary of a Call Girl, a television series known as 'Belle de Jour' in production

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