John Delos DeLamater (October 12, 1940 – December 13, 2017) was an American sociologist and sexologist who taught at the University of Wisconsin–Madison, where he was the Conway-Bascom Professor Emeritus in the Department of Sociology.

Sociology is the scientific study of society, patterns of social relationships, social interaction, and culture. It is a social science that uses various methods of empirical investigation and critical analysis to develop a body of knowledge about social order, acceptance, and change or social evolution.

John DeLamater was born to Clarence Delos DeLamater and Ethel Anna Hunter, on October 12, 1940, in San Diego, California. DeLamater earned a doctorate in social psychology from the University of Michigan in 1969, and joined the faculty of the University of Wisconsin–Madison the same year. Over the course of his career, DeLamater was named a fellow of the Society for the Scientific Study of Sexuality, received the Alfred E. Kinsey award for sex research, and served as editor of the Journal of Sex Research. He spent much of his life restoring, driving, and loving trains and PCC (Presidents' Conference Committee) streetcars. He donated two PCC streetcars to the City of Kenosha, Wisconsin which operate on their trolley line and are being dedicated to his memory.

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