Objective: In the contemporary aging society, subjective well-being is an important determinant of quality of life for older adults living alone. Although the association between improved health and subjective well-being in this population is well documented, the types of activities associated with subjective well-being are unclear.Methods: This study assessed the relationship between subjective well-being and activity types among older adults living alone based on a secondary analysis of the 2014 Survey of Attitudes Towards Older People Living Alone data. We conducted a Poisson regression analysis to determine the association between activity and subjective well-being.Results: After adjustment for age, sex, subjective physical health, subjective mental health, and income, higher levels of subjective well-being were significantly associated with spending time with family, meeting friends, playing with pets, eating, hiking, traveling, and watching sports.Conclusion: Going out and interactive activities, as well as individual activities outside the home, are associated with higher levels of subjective well-being. Promoting these activities has the potential to increase the subjective well-being of older adults.