Piergiorgio Odifreddi (born 13 July 1950 in Cuneo) is an Italian mathematician, logician and aficionado of the history of science, who is also extremely active as a popular science writer and essayist, especially in a perspective of philosophical atheism as a member of the Italian Union of Rationalist Atheists and Agnostics.
He is philosophically and politically near to Bertrand Russell and Noam Chomsky.