Mark Jerome Steedman (born 18 September 1946) is a British computational linguist and cognitive scientist. He earned a B.Sc. in Experimental Psychology and a Ph.D. in Artificial Intelligence from the University of Sussex and the University of Edinburgh.

Steedman graduated from the University of Sussex in 1968 with a B.Sc. in Experimental Psychology, and earned a Ph.D. in Artificial Intelligence from the University of Edinburgh in 1973 with the dissertation "The Formal Description of Musical Perception" (gained in 1972) advised by Prof. H.C. Longuet-Higgins FRS.^[2] He has held posts as Lecturer in Psychology at the University of Warwick (1977–83), Lecturer and Reader in Computational Linguistics at the University of Edinburgh (1983–8), and Associate and full Professor in Computer and Information Sciences at the University of Pennsylvania (1988–98). He has also held visiting positions at the University of Texas at Austin, the Max Planck Institute for Psycholinguistics, Radboud University Nijmegen, and the University of Pennsylvania, Philadelphia. Since 1998, Steedman has held the Chair of Cognitive Science in the School of Informatics at the University of Edinburgh.

He works in computational linguistics, artificial intelligence, and cognitive science on Generation of Meaningful Intonation for Speech by Artificial Agents, Animated Conversation, The Communicative Use of Gesture, Tense and Aspect, and combinatory categorial grammar (CCG). He is also interested in Computational Musical Analysis and combinatory logic.

Their distinctions include being named an AAAI Fellow in 1993, as well as being elected a Fellow of the British Academy and a Fellow of the Royal Society of Edinburgh in 2002. They were elected a Member of the Academia Europæa in 2006, served as the 2008 President-elect of the Association for Computational Linguistics, and became a Fellow of the Association for Computational Linguistics in 2012.

Mark Steedman's principal publications include Surface Structure and Interpretation, published by MIT Press in 1996. In 2000, he published The Syntactic Process through MIT Press. He also authored Information Structure and the Syntax-Phonology Interface, which appeared in Linguistic Inquiry in Fall 2000.