Anton Bruckner (German: [ˈantɔn ˈbʀʊknɐ] ( ); (1824-09-04)4 September 1824 – 11 October 1896(1896-10-11)) was an Austrian composer known for his symphonies, masses, and motets. The first are considered emblematic of the final stage of Austro-German Romanticism because of their rich harmonic language, strongly polyphonic character, and considerable length. Bruckner's compositions helped to define contemporary musical radicalism, owing to their dissonances, unprepared modulations, and roving harmonies.

Unlike other musical radicals, such as Richard Wagner or Hugo Wolf who fitted the enfant terrible mould, Bruckner showed extreme humility before other musicians, Wagner in particular. This apparent dichotomy between Bruckner the man and Bruckner the composer hampers efforts to describe his life in a way that gives a straightforward context for his music.