This study examined the mediating role of dysfunctional career thoughts in the relationship between career decision self‐efficacy (CDSE) and vocational identity (VI). For this purpose, the data were collected from 446 Korean college students. The authors used the Hayes () PROCESS tool to analyze the data. The results showed that CDSE positively correlated with VI, whereas all 3 types of dysfunctional career thoughts negatively correlated with CDSE and VI. The results also indicated that all 3 subscales of dysfunctional career thoughts partially mediate the association between CDSE and VI. We provide implications and limitations of the findings.