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Supplemental Nutrition Assistance Program (SNAP) participation has been demonstrated to improve household food insecurity, yet not all those who are eligible for the program participate. This article describes findings from both peer-reviewed and grey literature pertaining to factors that influence SNAP participation. SNAP participation has demonstrated benefits for low-income individuals and families for improving dietary intake, reducing food insecurity, and ultimately providing one strategy to alleviate poverty. The findings are described with a social science and behavioral lens in order to glean public health implications and recommendations from a broad array of literature. Factors influencing SNAP participation across the social–ecological model are discussed. Macro- and microlevel recommendations are made and actions applicable in targeted outreach, program, and organizational strategies are recommended. [ABSTRACT FROM PUBLISHER]