This comparative descriptive research had the objective of comparing the psychological well-being (PWB) among a group of 92 single people, 71 people who were in a relationship and 52 people who were married or in cohabitation, with ages ranging between 18 to 55. Ryff's (1989a) multidimensional scale of psychological well-being was applied, which evaluates six dimensions of psychological well-being (environmental mastery, purpose in life, autonomy, selfacceptance, personal growth, and positive relationships with others). The mean scores of independent samples were compared, before which there were no statistically significant differences in psychological well-being between single people, people who were in a relationship or married people, considering a confidence level of 95%. However, when the level of confidence of 97% is reduced, differences are determined between single people and people who are in a relationship, placing the former over others. Likewise, the interpretation of the results allowed to identify differences in the dimensions of psychological well-being that positions the people of the different groups above the others, according to the dimension.