This chapter discusses deontological, rights, utilitarian, and virtues ethical theories by analyzing the ethical theories in diverse occupations. Within the background of each ethical theory, a discussion of the historical, social, and personal provides information and characteristics of the theory. Finally, there is a discussion on how the various ethical theories can be applied to marginalized populations to ensure an environment that supports learning and diversity. In maintaining a socially, cultural, and economically sound environment, honest and transparent discussions, professional development, and truthful evaluations should occur to begin cycles anew. As these various ethical theories are implemented, a strong work ethic is required. The implication of these theories is to provide an atmosphere that is equitable, encourages learning, and protects and respects the humanity of others.