Atli Vilhelm Harðarson (born 6 January 1960 in Biskupstungur) is an Icelandic philosopher and secondary school teacher. He has mostly taught at Akranes and became the assistant of the school in 2001. He taught at the Menntaskólinn að Laugarvatni in 1996–1998. He is the author of numerous publications and scholarly work and writing books on philosophy and computing. He wrote about child bearing issues in 2007.
He studied philosophy at the University of Iceland and earned a BA degree in philosophy and literature in 1982. He awarded an MA degree in philosophy at Brown University in Providence, Rhode Island. In 2013, he earned a PhD in Education at the University of Iceland.
He became a member of the Icelandic Literary Association in 1998. He is mainly concerns with the issues of epistemology and metaphysics and the history of philosophy. He been most influenced by the authors René Descartes, Thomas Hobbes, GWF Hegel and John Stuart Mill, and from 20th century logic, analytic and policy studies. He mainly inspired in English liberalism, especially in classic authors such as John Locke and David Hume, but also to the ancient authors such as Plato and Aristotle, the subject of many of his history works.