Les Fleurs du mal (French pronunciation: [le fl dy mal]; English: The Flowers of Evil) is a volume of French poetry by Charles Baudelaire.

Les Fleurs du mal includes nearly all Baudelaire's poetry, written from 1840 until his death in August 1867. First published in 1857, it was important in the symbolist and modernist movements. Though it was extremely controversial upon publication, with six of its poems censored due to their immorality, it is now considered a major work of French poetry. The poems in Les Fleurs du mal frequently break with tradition, using suggestive images and unusual forms. They deal with themes relating to decadence and eroticism, particularly focusing on suffering and its relationship to original sin, disgust toward evil and oneself, obsession with death, and aspiration toward an ideal world. Les Fleurs du mal had a powerful influence on several notable French poets, including Paul Verlaine, Arthur Rimbaud, and Stphane Mallarm.

Charles Pierre Baudelaire (UK: , US: ; French: [ʃaʁl(ə) bodlɛʁ] (listen); 9 April 1821 – 31 August 1867) was a French poet who also produced notable work as an essayist and art critic. His poems exhibit mastery in the handling of rhyme and rhythm, contain an exoticism inherited from Romantics, but are based on observations of real life.His most famous work, a book of lyric poetry titled Les Fleurs du mal (The Flowers of Evil), expresses the changing nature of beauty in the rapidly industrializing Paris during the mid-19th century. Baudelaire's highly original style of prose-poetry influenced a whole generation of poets including Paul Verlaine, Arthur Rimbaud and Stéphane Mallarmé, among many others. He is credited with coining the term modernity (modernité) to designate the fleeting, ephemeral experience of life in an urban metropolis, and the responsibility of artistic expression to capture that experience.