There is no published work on different factor structures of the Psychopathy Checklist–Revised (PCL-R) for Korean offenders. The current study compared the two-, three-, and four-factor structures of the Korean version of the PCL-R. A total of 451 adult male serious offenders were included. The results suggested that both three- and four-factor models offered the best overall fit to the data. To gain better insight into the construct and predictive validities of the Korean version of the PCL-R, we recommend further analysis of the three- and four-factor models with recidivism and inmates’ implicit aggression levels.