The Women, Infants, and Children (WIC) program provides food vouchers to disadvantaged mothers and young children with the policy objective of improving nutrition and health outcomes. WIC is one of a few Federal public benefits programs with no restrictions on eligibility for immigrants. Research on immigrants’ use of this program, however, is scarce. This study examines WIC participation of low-income foreign-born mothers using data from the 2008 and 2009 Current Population Survey. The regression analysis shows that controlling for socioeconomic characteristics noncitizens are more likely than native-born mothers to participate in WIC, while there are no significant differences in participation between naturalized U.S. citizens and native-born mothers. Further, Hispanic mothers have higher predicted probability of participation than non-Hispanic mothers, regardless of nativity. The findings suggest that WIC is an important form of assistance for low-income immigrants who might not be eligible for or reluctant to use other public benefits.