The Byronic hero is a variant of the Romantic hero as a type of character, named after the English Romantic poet Lord Byron. Both Byron's own persona as well as characters from his writings are considered to provide defining features to the character type.

The Byronic hero first reached a very wide public in Byron's semi-autobiographical epic narrative poem Childe Harold's Pilgrimage (1812–1818). Historian and critic Lord Macaulay described the character as "a man proud, moody, cynical, with defiance on his brow, and misery in his heart, a scorner of his kind, implacable in revenge, yet capable of deep and strong affection". Despite Byron's clarifying Childe was a fictitious character in the preface of the work, "the public immediately associated Byron with his gloomy hero", with readers "convinced ... that Byron and Childe were one and the same".

Byron's poems with Oriental settings show more "swashbuckling" and decisive versions of the type. Later works show Byron progressively distancing himself from the figure by providing alternative hero types, like Sardanapalus (Sardanapalus), Juan (Don Juan) or Torquil ("The Island"), or, when the figure is present, by presenting him as less sympathetic (Alp in "The Siege of Corinth") or criticising him through the narrator or other characters. Byron would later attempt such a turn in his own life when he joined the Greek War of Independence, with fatal results, though recent studies show him acting with greater political acumen and less idealism than previously thought. The actual circumstances of his death from disease in Greece were unglamorous in the extreme, but back in England these details were ignored in the many works promoting his myth.