The present study used multiple regression analyses to examine the relationships between fifth-grade social skills and eighth-grade academic achievement. Data were drawn from the Early Childhood Longitudinal Study–Kindergarten Class of 1998-1999 (ECLS-K). Results indicated no relationship between positive or negative social behavior in fifth grade and academic achievement or teacher-rated academic skills in eighth grade. However, consistent with previous studies, fifth-grade approaches to learning were found to be positive predictors of both academic achievement and teacher-rated academic skills in eighth grade. In addition, these results suggest that socioeconomic status plays a significant and potentially unexplored avenue for understanding these outcomes. These results further illuminate the way behaviors in elementary school relate to academic adjustment to middle school.