Act 1

Nighttime. Don Giovanni's servant Leporello complains that his master's libertinage is a constant pain in the neck for him. As of now, Don Giovanni has sneaked into Donna Anna’s, and Leoprello is waiting for him outside. But this time Don Giovanni does not succeed: Donna Anna makes noise and won’t let her seducer escape. She cannot recognize him, though, for he is wearing a mask. Donna Anna’s father, the Commendatore, challenges Don Giovanni to a duel and dies. Donna Anna and her fiancé swear to avenge the murder.

Leporello is shocked by the tragic incident, while Don Giovanni is keeping cool. He is anticipating a date, and in the meantime is about to follow a beautiful female stranger - but then he recognizes in her his long-forsaken lover Donna Elvira, whose suffering only annoys him. Leporello tells Donna Elvira all about his master and shows her the list of his conquests.