Background: Parenting styles are associated with various health outcomes among children, such as fruit and vegetable consumption, physical activity, and emotional well-being. Previous literature suggests that responsive parenting styles are associated with improved mental health outcomes. This study examines the association between an adult’s responsive parenting style and the psychosocial outcomes of emotion regulation and loneliness among children. Methods: Using data from the U.S. National Cancer Institute’s Family Life, Activity, Sun, Health, and Eating (FLASHE) cross-sectional survey, this secondary data analysis study seeks to understand how perceived parental responsiveness is associated with adolescents’ emotional health outcomes from the perspective of the adolescent. The sample consisted of 12- to 17-year-olds (n = ~1560), mostly female (50.2%) and non-Hispanic White (63.7%), with a mean age of 14.48 years (SD = 1.61). Results: Through multivariable regression, we found that perceived parental responsiveness negatively predicted adolescent emotion suppression (β = −0.29, p < 0.001), even after controlling for sex, age, race/ethnicity, parental marital status, parental education level, parent’s time spent at work, and the number of kids in the household (β = −0.29, p < 0.001). We also found that perceived parental responsiveness was the strongest predictor for adolescent loneliness (β = −0.27, p < 0.001), even when controlling for sex, age, race/ethnicity, parental marital status, parental education level, parent’s time spent at work, and the number of kids in the household (β = −0.28, p < 0.001). Conclusions: These results suggest that implementing interventions targeting parental responsiveness may be beneficial to improving adolescents’ emotional well-being.