John Lloyd Ackrill FBA (30 December 1921 – 30 November 2007) was an English philosopher and classicist who specialized in Ancient Greek philosophy, especially the philosophy of Plato and Aristotle. Ackrill has been said to be, along with Gregory Vlastos and G. E. L. Owen, one of the most important scholars of Greek philosophy in the English-speaking world in the latter half of the 20th century.
Ackrill was a visiting scholar at the Institute for Advanced Study in 1950-51 and again in 1961-62. At the time of his death he was Emeritus Professor of the History of Philosophy and Fellow of Brasenose College, Oxford.
Ackrill was born in Reading, Berkshire where he attended Reading School. He read classical mods at St John's College, Oxford.
- Essays on Plato and Aristotle (1997)
- Aristotle the Philosopher (1981)
- Aristotle's Ethics (1983)
Translations and commentaries
- Aristotle, A New Aristotle Reader (1988)
- Aristotle, Categories and De Interpretatione (1963)