The hero of the opera, Hoffmann himself is there, drinking with a number of gay young students, his friends. He is in a despondent mood and when urged by his companions to tell them the reason of his depression, he declares himself ready to relate the story of his three love adventures, while his friends sit round a bowl of flaming strong punch.
Now the scene changes and the curtain rises on the first act. We find Hoffmann in Spalanzani's house. This man is a famous physiologist, and Hoffmann has entered his house as his pupil in order to make the acquaintance of the professor's beautiful daughter Olympia, whom he has seen at a distance.
This daughter is nothing more than an automaton, that has been manufactured by Spalanzani and his friend, the wizard Coppelius. This doll can sing, dance and speak like a human being. Spalanzani hopes to become rich by means of this clever work of art. As half of Olympia (this is the doll's name), belongs to Coppelius, Spalanzani buys her from him, paying him by a draft on the Jew Elias, though he knows him to be bankrupt.—Hoffmann has been persuaded by Coppelius to purchase a pair of spectacles, through which he looks at Olympia, and taking her for a lovely living maiden falls violently in love with her.
Spalanzani now gives a grand entertainment, at which he presents his daughter Olympia, (the Automaton), who surprises everybody by her loveliness and her fine singing.—Hoffmann is completely bewitched and as soon as he finds himself alone with her, he makes her an ardent declaration of love and is not at all discouraged by her sitting stock still and only answering from time to time a dry little "ja, ja". At last he tries to embrace her, but as soon as he touches her she rises and trips away.
Hoffmann's friend Niklas finds him in the seventh heaven of rapture and vainly endeavours to enlighten him as to the reason of the beauty's stiffness and heartlessness.
When the dancing begins Hoffmann engages Olympia, and they dance on, always faster and faster, until Hoffmann sinks down in a swoon, his spectacles being broken by the fall. Olympia spins on alone as fast as ever and presently dances out of the room, Cochenille vainly trying to stop her. Coppelius now enters in a fury having found out that Spalanzani's draft on Elias is worthless. He rushes to the room, into which Olympia has vanished and when Hoffmann revives he hears a frightful sound of breaking and smashing, and Spalanzani bursts in with the news that Coppelius has broken his valuable automaton. Thus Hoffmann learns that he has been in love with a senseless doll. The guests, who now enter shout with laughter at his confusion, while Spalanzani and Coppelius load each other with abuse.
The second act takes place in Giulietta's palace in Venice. Everything breathes joy and love.—Both Niklas and Hoffmann are courting the beautiful lady. Niklas warns his friend against her, but Hoffmann only laughs at the idea that he is likely to love a courtezan. The latter is entirely in the hand of the wizard Dapertutto, who acts towards Hoffmann as an evil spirit under three different names in each of his three love affairs. Giulietta has already stolen for him the shadow of her former lover Schlemihl; now Dapertutto wounds her vanity, by telling her, that Hoffmann has spoken disdainfully of her, and makes her promise to win the young man's love and by that means to make him give her his reflection from a looking-glass.
She succeeds easily, and there ensues a charming love-duet, during which they are surprised by the jealous Schlemihl. Giulietta tells Hoffmann, that her former lover has the key of her apartments in his pocket, she then departs leaving the two lovers and Dapertutto alone. When Hoffmann peremptorily demands the key from Schlemihl the latter refuses to give it up. The result is a duel, for which Dapertutto offers Hoffmann his sword.—
After a few passes Schlemihl is killed and Dapertutto disappears. A few moments afterwards Giulietta's gondola passes before the balcony and Hoffmann sees her leaning on Dapertutto's arm, singing a mocking farewell to the poor deserted lover.
The third act takes place in Rath Krespel's house. His daughter Antonia has inherited her mother's gift of a beautiful voice, but alas, also her tendency to consumption. The greatest joy of her life is singing, which however her father has forbidden, knowing this exertion to be fatal to his darling.