Abstract Robert Trivers is one of the leading figures pioneering the field of sociobiology. For Natural Selection and Social Theory, he has selected eleven of his most influential papers, including several classic papers from the early 1970s on the evolution of reciprocal altruism, parent-offspring conflicts and asymmetry in sexual selection, which helped to establish the centrality of sociobiology, as well as some of his later work on deceit in signalling, sex antagonistic genese, and imprinting. Trivers introduces each paper, setting them in their contemporary context, and critically evaluating them in the light of subsequent work and further developments. The result is a unique portrait of the intellectual development of sociobiology, with valuable insights of interest to evolutionary biology, anthropology, and psychology.