Percy Bysshe Shelley (August 4, 1792 – July 8, 1822) was one of the major English Romantic poets and is critically regarded as among the finest lyric poets in the English language. Shelley was famous for his association with John Keats and Lord Byron. The novelist Mary Shelley (née Godwin) was his second wife.

He is most famous for such classic anthology verse works as Ozymandias, Ode to the West Wind, To a Skylark, Music, When Soft Voices Die, The Cloud and The Masque of Anarchy, which are among the most popular and critically acclaimed poems in the English language. His major works, however, are long visionary poems which included Queen Mab (later reworked as The Daemon of the World), Alastor, The Revolt of Islam, Adonaïs and the unfinished work The Triumph of Life. The Cenci (1819) and Prometheus Unbound (1820) were dramatic plays in five and four acts respectively. Although he has typically been figured as a "reluctant dramatist," he was passionate about the theatre, and his plays continue to be performed today. He wrote the Gothic novels Zastrozzi (1810) and St. Irvyne (1811) and the short prose works "The Assassins" (1814), "The Coliseum" (1817) and "Una Favola" (1819).

Shelley's unconventional life, alongside a common perception of his thought as uncompromising idealism, combined with his strong disapproving voice, made him a marginalized figure during his life, important in a fairly small circle of admirers, and opened him to criticism as well as praise afterward. He never lived to see the extent of his success and influence; although some of his works were published, they were often suppressed upon publication.