"The Possibility of Naturalism" by Roy Bhaskar is a significant work in contemporary philosophy of science and social sciences, which has had a lasting impact on the field since its first publication in 1979. It is considered one of the cornerstones of the critical realism position, viewed as one of the few viable alternatives to positivism and post-positivism. This fourth edition includes a new preface by Mervyn Hartwig, the founding editor of the "Journal of Critical Realism" and a principal author of the "Dictionary of Critical Realism." The book offers an in-depth analysis and discussion of the possibilities of naturalism and its implications for the philosophy of science and social sciences.