Raymond Geuss (/ɡɔɪs/; born 1946), Emeritus Professor in the Faculty of Philosophy, University of Cambridge, is a political philosopher and scholar of 19th and 20th century European philosophy. Geuss is primarily known for three reasons: his early account of ideology critique in The Idea of a Critical Theory; a recent collection of works instrumental to the emergence of Political Realism in Anglophone political philosophy over the last decade, including Philosophy and Real Politics; and a variety of free-standing essays on issues including aesthetics, Nietzsche, contextualism, phenomenology, intellectual history, culture and ancient philosophy.