This longitudinal study examined the effects of formal (i.e., school-based) and informal (i.e., home-based) Latino parent involvement using data from the National Educational Longitudinal Study (NELS:88). Both forms of support were significant predictors of student achievement; the impact of informal support was nearly as great as that of formal support. It was suggested that Latino students benefit from both methods of involvement, and both formal and informal parent involvement should be acknowledged and supported. This study fills a gap in the literature by discussing parent involvement as a multidimensional construct, looking at the effects of parent involvement in a sample of Latino secondary students, and viewing Latino parental involvement as a strength instead of something that is lacking. (Contains 3 tables.)