Charles C. Ragin (born c. 1952) is Chancellor's Professor of Sociology at the University of California, Irvine.
Ragin graduated with a B.A. in sociology from the University of Texas at Austin in May, 1972. He completed his Ph.D. in sociology from the University of North Carolina at Chapel Hill in 1975.
After completing his Ph.D., Ragin joined the faculty at Indiana University Bloomington. He left Indiana University in 1981. He worked on the faculty of Northwestern University from 1981 to 2001. He was also a professor at the University of Oslo in Norway from 1998 to 2001. From 2001 through 2012, he was a professor of sociology and political science at the University of Arizona. He began his position at the University of California, Irvine in 2012.
Ragin has made many contributions to sociology. He is a proponent of using fuzzy sets to bridge the divide between quantitative and qualitative methods. His main interests are methodology, political sociology, and comparative-historical research, with a special focus on such topics as the welfare state, ethnic political mobilization, and international political economy. He is also the author of more than 100 articles in research journals and edited books, and he has developed software packages for set theory analyses of social data, Qualitative Comparative Analysis (QCA) and fuzzy set Qualitative Comparative Analysis (fsQCA).