La Péri or The Flower of Immortality, is a 1912 ballet composed by French composer Paul Dukas in one act. La Peri is originally choreographed by Ivan Clustine and first performed in Paris. It's about a man's search for immortality and encounter with a mythological Peri.

At the end of his days of youth, the Magi having observed that his star had faded, Iskender travels throughout Iran in search of the Flower of Immortality. After three years of looking and wandering, he finally arrives at the Ends of the Earth, a place of utmost tranquility and calm. Iskender finds a temple to Ormuzd, and on its steps is a Peri. With a star flashing above her head and a lute in one hand, the Peri carries the Flower of Immortality, a lotus decorated with emeralds, in the other.

Later, as the Peri is sleeping, Iskender steals the Flower, careful to avoid making noise so that she does not wake up. Immediately the Flower sparkles brightly in his hands, and when the Peri wakes up, she strikes her hands against each other and lets out a great cry, because without the Flower she cannot enter into the presence of the light of Ormuzd. Upon this realization, Iskender delights at the power he now seemingly has over the Peri.

While in his hand, however, the Flower is transformed by Ormuzd to Iskender’s earthly and material desires. This is a sign to the Peri that possession of the Flower is not intended for Iskender, and so she performs a dance, gradually coming closer and closer until she is able wrest the Flower from him. As the Peri slowly disappears in the light and returns to Paradise, Iskender realizes with calmness that he has been stranded and left to die.

The original music to La Péri was written in 1911 by Paul Dukas as a Poème dansé en un tableau ("dance poem in one scene"), his last published work. Although not as well known as his famous symphonic poem L'apprenti sorcier, the ballet is widely considered his most mature and skilled piece.

The music's style can best be described as a mixture of Romantic tonal harmony and orchestration techniques with Impressionism, and is distinctly French. The ballet itself is preceded by a brilliant fanfare that uses the orchestra's brass section, and which is often performed separately.