David Ross Howarth (born 10 November 1958) is a British academic and politician who was the Liberal Democrat Member of Parliament for Cambridge from 2005–10. He served as an Electoral Commissioner between 2010 and 2018. He is Professor of Law and Public Policy at the University of Cambridge.
He is the author of Textbook on Tort, Law as Engineering: Thinking about What Lawyers Do and articles in academic journals and chapters in academic books. He researches into a broad range of public and private law areas, conducting empirical research. He has engaged in policy making and leadership in public roles, previously as Leader of Cambridge City Council, and as a member of the Liberal Democrats' Federal Policy Committee.