BackgroundStudies have revealed that grit personality and non-attachment are positively associated with happiness. Grittier people are happier while they persist in pursuing their long-term goal, whereas non-attached people are hap-pier as they are not clinging onto any object. These contrasting findings seem to suggest that the two concepts may have some relevancies. Accordingly, this study aims to use the mediator and moderator models to exam-ine whether grit personality either moderates or mediates the effects of non-attachment on happiness.Participants and procedureThree hundred sixty undergraduates were recruited by the purposive sampling method to participate in a survey. They needed to fill in the Short Grit Scale, Non-Attachment Scale and Subjective Happiness Scale.ResultsThe results showed that non-attachment is positively associated with a component of grit; that only persever-ance of efforts, but not consistency of interest, was positively associated with non-attachment. In addition, per-severance of efforts mediates rather than moderates the effects of non-attachment on happiness.ConclusionsThe findings suggesting that non-attached people are happier does not mean they detach from life. They are able to work with perseverance on their long-term goals, but they do not attach to the outcome of their goals. The findings provide further conceptual clarification of grit personality and non-attachment and further infor-mation to educators and program managers while designing programs to improve happiness.