Buch Wien is an international book fair and knowledge festival held in Vienna, bringing together book exhibition activity, literary programming, public debate, and citywide cultural experiences as one of the important publishing and reading platforms in the German-speaking market.

The official presentation describes it as the third-largest German-language book fair and highlights five days of stage conversations, panel discussions, and knowledge-led exchange involving authors, publishers, experts, and readers from the German-speaking world and beyond across literature, society, science, business, and politics.

The 2026 edition runs from November 25 to November 29 at Messe Wien, Halls D + C, with additional evening events staged at various locations across Vienna. The official about page states that the 2025 edition welcomed 72,000 visitors.