The purpose of this research was to determine the effects of attachment styles and academic procrastination on subjective well-being in university students. In line with the causal research design, the sample consisted of 733 university students, 513 female and 220 male. The Subjective Well-Being Scale, the Academic Procrastination Scale, the Relationship Scales Questionnaire and a Personal Information Form were used for data collection. Data were subjected to path analysis. The findings from the study show that a preoccupied attachment style has a direct, positive effect on academic procrastination, while academic procrastination has a direct, negative effect on subjective well-being. We concluded that a preoccupied attachment style has an indirect effect on subjective well-being.