Christiaan Willem Simon Monden (born 26 March 1975 in Noordwijkerhout) is a Dutch sociologist and a professorial fellow in sociology at Nuffield College, University of Oxford. Monden has research interests in family sociology; social demography; social inequalities; social variations in health and mortality. Monden is director of graduate studies at Nuffield College. With Jeroen Smits, Monden established a database of twins for 76 developing countries that contains information on around 2.5 million births by 1.4 million women.