[Revised entry by Jeff Malpas on April 28, 2023. Changes to: Main text, Bibliography] Donald (Herbert) Davidson was one of the most important philosophers of the latter half of the twentieth century whose reception and influence is matched, among American philosophers, perhaps only by that of his teacher, W. V. O. Quine. Davidson's ideas, presented in a series of essays (and one posthumous monograph) from the 1960s onwards, have had an impact in a range of areas from semantic theory through to epistemology and ethics. His work exhibits a breadth of approach, as well as a unitary and systematic character, that is...