James W. Lenman is a British philosopher and Professor of Philosophy at the University of Sheffield. He is known for his expertise on ethics. Lenman is a former president of the British Society for Ethical Theory (2002-2008). His recent work has dealt with issues relating to moral realism, moral expressivism, moral psychology, moral epistemology, and moral responsibility, compatibilism, consequentialism, contractualism, constructivism and contingency.