The Poem of Ecstasy (Le Poème de l'extase), Op. 54, is a symphonic poem by Russian composer and pianist Alexander Scriabin written between 1905 and 1908, when Scriabin was actively involved with the Theosophical Society. The 20-minute work premiered on 10 December 1908 in New York City.

Scriabin sometimes referred to The Poem of Ecstasy as his "fourth symphony", although it was never officially called such and avoids the traditional division into separate movements. There are traces of the classical sonata key-scheme that Scriabin had employed previously, but it is no longer structurally important. As described by Bernard Jacobson, "The form depends instead on the constant interpenetration and cross-fertilization of a multiplicity of tiny thematic units, most of them so sinuously chromatic as to subvert tonal feeling almost entirely beneath the vertiginous onslaught of shifting harmonic colors."

Much of the work has a feeling of timelessness and suspense, because of its rhythmic ambiguity and whole-tone-based dominant harmonies derived from Scriabin's "mystic chord" (since the whole-tone scale has no leading-tones, any harmony based on it will not lean toward any key in particular, allowing Scriabin to write pages of music with little to no tonal resolution).

The work can be split into three major theme groups: one group that is characterized by slower chromatic winding, one faster and more agitated group characterized by quick leaps and trills, and one featuring three themes presented by the brass (a horn fanfare to provide a rhythmic motif, a trumpet fanfare emerging from the surrounding texture, and a more lyrical trumpet theme). These three groups are presented separately at the outset of the piece, but are later developed and combined in different ways. The piece also builds to two major climaxes: one in the middle and one at the end. Both are built on themes from the third group and accompanied by string and woodwind tremolos and trills. At the second climax, Scriabin introduces low bells and organ, and maintains a trumpet and percussion ostinato throughout.

Scriabin wrote a poem over three hundred lines long to accompany the music, though not to be recited with it. The poem tracks the ascent of a spirit into consciousness, catalyzed by the recurring appearance of "trembling presentiments of dark rhythms" that later transform into "bright presentiments of shining rhythms" as the spirit realizes the excitement of the struggle against them, contrasted with the "boredom, melancholy, and emptiness" felt after victory over them. The ascent into consciousness is illustrated by the gradual shift from third-person "Spirit" to first person "I". Scriabin also based his fifth piano sonata on the poem, and in the first publication of the sonata he included the following lines:

Я к жизни призываю вас, скрытые стремленья!
Вы, утонувшие в темных глубинах
Духа творящего, вы, боязливые
Жизни зародыши, вам дерзновенье приношу

Je vous appelle à la vie, ô forces mystérieuses!
Noyées dans les obscures profondeurs
De l’esprit créateur, craintives
Ébauches de vie, à vous j’apporte l’audace

I call you to life, oh mysterious forces!
Drowned in the obscure depths
Of the creative spirit, timid
Shadows of life, to you I bring audacity!