Self-regulation is an important prerequisite for successful academic achievement, particularly for children who are at risk for Attention Deficit Hyperactivity Disorder (ADHD). We taught Mental Contrasting with Implementation Intentions (MCII), a technique that is known to facilitate the self-regulation of goal pursuit, to schoolchildren (sixth- and seventh-graders) both at risk and not at risk for ADHD. Parents rated their children's level of self-regulation 2 weeks after the intervention. Children at risk and not at risk benefited from MCII more than from a learning style intervention only and the benefits of MCII were particularly strong for children at risk for ADHD. The results have implications with respect to supporting children's self-regulation in their everyday school lives.