Giacomo Girolamo Casanova (, Italian: [ˈdʒaːkomo dʒiˈrɔːlamo kazaˈnɔːva, kasa-]; 2 April 1725 – 4 June 1798) was an Italian adventurer and author from the Republic of Venice. His autobiography, Histoire de ma vie (Story of My Life), is regarded as one of the most authentic and provocative sources of information about the customs and norms of European social life during the 18th century.

Casanova, depending on circumstances, used more or less fictitious names, such as baron or count of Farussi (the maiden name of his mother) or Chevalier de Seingalt (French pronunciation: ​[sɛ̃ɡɑl]). He often signed his works as "Jacques Casanova de Seingalt" after he began writing in French following his second exile from Venice.

He has become famous for his often complicated and elaborate affairs with women that his name is now synonymous with "womanizer". He claims to have mingled with European royalty, popes, and cardinals, along with the artistic figures Voltaire, Goethe, and Mozart. He spent his last years in the Dux Chateau (Bohemia) as a librarian in Count Waldstein's household, where he also wrote the story of his life.