Appeals to fairness are omnipresent in everyday life, but there is little agreement about what the term “fairness” truly means. This thesis will map philosophical models of procedural and distributive fairness onto psychological analyses to critically evaluate psychological studies of fairness. I find that psychological literature and philosophical literature are consistent when studying distributive fairness, but the psychological literature does not consistently attempt to define and study procedural fairness. This lack of definition results in inconsistency within the psychological study of fairness that leaves gaps in the literature.