Odilon Redon (born Bertrand Redon; French: [ɔdilɔ̃ ʁədɔ̃]; 20 April 1840 – 6 July 1916) was a French Symbolist draftsman, printmaker, and painter.

Early in his career, both before and after fighting in the Franco-Prussian War, Redon worked almost exclusively in charcoal and lithography, works known as his noirs. He gained recognition after his drawings were mentioned in the 1884 novel À rebours (Against Nature) by Joris-Karl Huysmans. During the 1890s, Redon began working in pastel and oil, which quickly became his favorite medium, abandoning his previous style of noirs completely after 1900. He developed a keen interest in Hindu and Buddhist religion and culture, which increasingly showed in his work.

Redon is perhaps best known today for the dreamlike paintings created in the first decade of the 20th century, which were inspired by Japanese art and leaned toward abstraction. His work is considered a precursor to Surrealism.

Odilon Redon was born, on 20 April 1840, in Bordeaux, Aquitaine, to a prosperous family. Redon's father made his fortune in the slave trade in Louisiana in the 1830s. Redon was conceived in New Orleans and the couple made the transatlantic journey back to France while his mother Marie Guérin, a French Creole woman, was pregnant with his brother Gaston. The young Bertrand Redon acquired the nickname "Odilon" from his mother's first name, Odile. Redon started drawing as a child; at the age of ten, he was awarded a drawing prize at school. He began the formal study of drawing at fifteen but, at his father's insistence, he changed to architecture. Failure to pass the entrance exams at Paris' École des Beaux-Arts ended any plans for a career as an architect, although he briefly studied painting there under Jean-Léon Gérôme in 1864. (His younger brother Gaston Redon would become a noted architect.)

Back in his native Bordeaux, he took up sculpting, and Rodolphe Bresdin instructed him in etching and lithography. His artistic career was interrupted in 1870 when he was drafted to serve in the army in the Franco-Prussian War until its end in 1871.

At the end of the war, Redon moved to Paris and resumed working almost exclusively in charcoal and lithography. He called his visionary works, conceived in shades of black, his noirs. It was not until 1878 that his work gained any recognition with Guardian Spirit of the Waters; he published his first album of lithographs, titled Dans le Rêve, in 1879. Still, Redon remained relatively unknown until the appearance in 1884 of a cult novel by Joris-Karl Huysmans titled À rebours (Against Nature). The story featured a decadent aristocrat who collected Redon's drawings.

In 1886, Redon exhibited his work with the Impressionists in their last exhibition. The same year, he also began participating in the exhibitions of Les XX in Brussels.

In the 1890s, Redon worked in pastel and oil; he did not make noirs after 1900. In 1899, he exhibited with the Nabis at Durand-Ruel's.