Hans-Georg Gadamer (; German: [ˈɡaːdamɐ]; 11 February 1900 – 13 March 2002) was a German philosopher of the continental tradition, best known for his 1960 magnum opus, Truth and Method (Wahrheit und Methode), on hermeneutics.

In Truth and Method, Gadamer argued against the idea that meaning could be found through objective methods. Instead, he posited that understanding is a product of a historically-effected consciousness, shaped by an individual's cultural and historical context. Interpreting a text, he argued, involves a fusion of horizons between the interpreter and the text, and this interaction leads to a deeper understanding of the subject matter. Gadamer's work has become influential in communication ethics, contributing to the formulation of dialogic coordinates and promoting mutual understanding and learning in communication. In addition to his work in hermeneutics, Gadamer published extensively on Greek philosophy, particularly Plato and Aristotle.

Born in Marburg, Germany, he studied classics and philosophy under Neo-Kantian philosophers before becoming a student of Martin Heidegger. Despite his lack of political involvement during the Nazi regime, his relationship with the Nazis has been a subject of debate among scholars. After World War II, he left East Germany for West Germany, where he completed Truth and Method and engaged in notable debates with other philosophers.