Mark D. Sacks (December 29, 1953 – June 17, 2008) was a British philosopher in the fields of Kant, Post-Kantian idealism, and the epistemological tradition in European Philosophy. He was one of the few philosophers who sought the way to unite Analytic philosophy with Continental philosophy.
He founded the European Journal of Philosophy in 1993. He was a professor of philosophy at the University of Essex until his death.
His first degree was in philosophy, at Hebrew University of Jerusalem. He obtained a doctorate in philosophy from King's College, Cambridge under the supervision of Bernard Williams.
He died from prostate cancer at the age of 54.