Previous studies have revealed a correlation between self-focused rumination and the forgiveness of self and others. However, the correlation between self-focused reflection and two dimensions of self-esteem: contingent self-esteem and sense of authenticity has not yet been studied. The purpose of this study was to investigate the effects of self-focused rumination and reflection on the forgiveness of others and on negative and positive forgiveness of self when mediated by contingent self-esteem and sense of authenticity. To test the validity of the model used in this study, structural equation modeling and mediation analysis were used to analyze data collected from 247 undergraduate students. When contingent self-esteem was the mediator, the results showed a correlation between self-focused rumination and both negative and positive forgiveness of self. When a sense of authenticity was the mediator, there was a correlation between self-focused rumination and positive forgiveness of both self and others.