The purpose of the study was to assess the relationship between life satisfaction and seven health behaviors in young adults and investigate the consistency of associations across regions. 17,246 students aged 17-30 years from 21 countries completed questionnaire measures of life satisfaction, smoking, physical exercise, alcohol consumption, sun protection, fruit intake, fat consumption, and fiber intake. Life satisfaction was positively associated with not smoking, physical exercise, using sun protection, eating fruit, and limiting fat intake, but was not related to alcohol consumption or fiber intake.