Hugo Laurenz August Hofmann von Hofmannsthal (German: [ˈhuːɡo fɔn ˈhoːfmanstaːl] ^ⓘ; 1 February 1874 – 15 July 1929) was an Austrian novelist, librettist, poet, dramatist, narrator, and essayist.

Hofmannsthal was born in Landstraße, Vienna, the son of an upper-class Christian Austrian mother, Anna Maria Josefa Fohleutner (1852–1904), and a Christian Austrian–Italian bank manager, Hugo August Peter Hofmann, Edler von Hofmannsthal (1841–1915).

His grandfather was Augustin Emil Hofmann von Hofmannsthal and his great-grandfather was Isaak Löw Hofmann, Edler von Hofmannsthal, from whom his family inherited the noble title "Edler von Hofmannsthal", was a Jewish tobacco farmer ennobled by the Austrian emperor.

He was schooled in Vienna at Akademisches Gymnasium, where he studied the works of Ovid, later a major influence on his work. He began to write poems and plays from an early age. Some of his early works were written under pseudonyms, such as Loris Melikow and Theophil Morren, because he was not allowed to publish as a student. He met the German poet Stefan George at the age of seventeen and had several poems published in George's journal, Blätter für die Kunst. He studied law and later philology at the University of Vienna but decided to devote himself to writing upon graduating in 1901. Along with Peter Altenberg and Arthur Schnitzler, he was a member of the avant garde group Young Vienna (Jung–Wien).

In 1900 Hofmannsthal met the composer Richard Strauss for the first time. He later wrote libretti for several of his operas, including Elektra (1909), Der Rosenkavalier (1911), the plot of which he developed together with Harry Graf Kessler, Ariadne auf Naxos (1912, rev. 1916), Die Frau ohne Schatten (1919), Die ägyptische Helena (1928), and Arabella (1929, but first performed in 1933).

Between 1891 and 1899 Hofmannsthal wrote a number of short verse plays, influenced by the static dramas of the Belgian writer Maurice Maeterlinck, the dramatic monologues of the English Romantic poet Robert Browning, and the proverbes dramatiques of the French poet Alfred de Musset.

In 1911 he adapted the 15th century English morality play Everyman as Jedermann, and Einar Nilson wrote the music for it. The play later became a staple at the Salzburg Festival.

During World War I Hofmannsthal held a government post. He wrote speeches and articles supporting the war effort, and emphasizing the cultural tradition of Austria-Hungary. The end of the war spelled the end of the Habsburg monarchy in Austria; this was a blow from which the patriotic and conservative-minded Hofmannsthal never fully recovered.