Stephan Hartmann (born 1 March 1968) is a German philosopher and Professor of Philosophy of Science at Ludwig Maximilian University of Munich, known for his contributions to formal epistemology.

Hartmann was born in Limburg an der Lahn in Hesse, Germany.

He studied physics and philosophy at Justus Liebig University in Giessen, Germany and received his bachelor's degree in 1989.

Back in Germany in 2002 at the University of Konstanz he headed the research group Philosophy, Probability and Modelling together with Luc Bovens.

From 2004 to 2006 he led the Centre for Philosophy of Natural and Social Science (CPNSS) at the London School of Economics and Political Science, and became Professor in LSE's Department of Philosophy, Logic and Scientific Method.