Background: Creasing the older adult population has become a major public health challenge. Social support plays an important role in people's health. Social support helps improve the living conditions of the elderly and brings happiness into the lives of the elderly. This study aimed to investigate the relationship between social support and happiness status in 60–75-year-olds referred to health centers of Zarrin Shahr, Iran in 2019.Methods: In this cross-sectional study, 584 samples (female: 62.2%, men: 37.8%) participated in this study. To collect data for this study, Oxford Happiness, and Social Support questionnaires were used. The older adults of the target group were selected through simple multistage random sampling from the health centers of Zarrin Shahr. The collected data were entered into SPSS software version 22. They were described and analyzed by inferential statistics and regressions at a 95% confidence level.Results: Sex, marital status, and level of education influenced total social support (P < 0.05). Moreover, age, marital status, and level of education affected happiness (P < 0.05). There was a significant positive correlation between total social support and components of social support with happiness (P < 0.05). Also, the multi-stage regression test showed emotional social support and education level were highly correlated with happiness (R2 = 0.265).Conclusion: The results highlight the need to increase social support for older adults because it can increase the level of happiness in this age group. In interventions to improve the social support and happiness of older adults, low-educated, unmarried, divorced, or deceased spouses should be prioritized.