Kielhofner’s A Model of Human Occupation was used to guide a study on the effect of occupational behavior (defined as the type, amount, and meaningfulness of one’s activities) on life satisfaction in retirees. Seventy-nine volunteers from a variety of settings for the elderly completed a questionnaire about the amount and types of their activities, the meaningfulness of their activities (i.e., enjoyability, autonomy, and competency), and life satisfaction. The results demonstrated that occupational behavior plays a significant role in affecting life satisfaction among retirees.