Despite the term being coined in the early 1990s, heteronormativity is a longstanding and enduring hierarchical social system that identifies heterosexuality as the standard sexuality and normalizes gender-specific behaviors and roles for men, women, and transgender and non-binary individuals. As a system, it defines and enforces beliefs and practices about what is ‘normal’ in everyday life. Although there are many factors that shape heteronormative beliefs and attitudes, religion, the government, education, and workplaces are the principal macro-level factors that normalize and institutionalize heteronormative beliefs and attitudes. These institutions contribute an outsize influence on the perpetuation of heteronormativity in society because these institutions create and inculcate the norms and standards of what are and are not acceptable values, attitudes, beliefs, and behaviors in our society. As such, in order to create effective interventions to eliminate the negative outcomes of heteronormativity, particular attention should be paid to each of these institutions. Parents, relatives, and other adults contribute to the normalization and institutionalization of heteronormativity at the individual- or micro-level. Although some people benefit from the system of heteronormativity (mainly heterosexual cisgender conforming men), much of the research on heteronormativity focuses on the negative outcomes. Heteronormativity is responsible for a host of pernicious outcomes such as lower self-esteem, job satisfaction, and organizational commitment, and greater rates of suicide ideation, verbal and physical abuse, and workplace mistreatment and discrimination. Future research should investigate identify effective micro- and macro-level interventions that could mitigate or eliminate the negative effects of heteronormativity.