This study examined the relationship between the executive control process of inhibition and self-reported dispositional mindfulness, controlling for gender, grade, and cortisol levels in 99 (43% female) fourth- and fifth-graders ( = 10.23 years, SD = 0.53). Students completed a measure of mindful attention awareness and a computerized executive function (EF) task assessing inhibitory control. Morning cortisol levels also were collected and were used as an indicator of neuroendocrine regulation. Hierarchical regression analyses revealed that, after controlling for gender, grade, and cortisol levels, higher scores on the mindfulness attention awareness measure significantly predicted greater accuracy (% correct responses) on the inhibitory control task. This research contributes to understanding the predictors of EF skills in early adolescents’ cognitive development. Specifically, it identifies mindfulness—a skill that can be fostered and trained in intervention programs to promote health and well-being—as significantly related to inhibitory processes in early adolescence.