People who believe that human attributes are immutable (entity theorists) display preferences for stereotype-consistent over stereotype-inconsistent information (J. E. Plaks, S. J. Stroessner, C. S. Dweck, & J. W. Sherman, 2001). In this article, the authors argue that entity theories are components of broader sets of beliefs that represent differences between people in terms of underlying essences. Consistent with expectations, the authors found that measures of essentialist beliefs (i.e., in the biological basis, discreteness, informativeness, and inherence of human attributes) covaried with the presence of entity theories. Essentialist beliefs as a set were related to stronger preferences for stereotype-consistent information, and this effect was not reducible to the effect of entity theories. The authors propose that research on implicit person theories can be placed within an encompassing framework of psychological essentialism.