Developmental coordination disorder (DCD) is frequently comorbid with attention-deficit hyperactivity disorder (ADHD). DCD results in functional impairment in activities of daily living, and children’s physical activities with peers. Children with DCD report fewer friendships, more bullying, and less confidence in their ability to participate in peer activities. DCD is frequently associated with depressive and anxiety disorders. Because of its relationship with lower level of physical activity, DCD is a risk factor for obesity, cardiovascular disease, and diabetes mellitus. The developmental outcomes of DCD persist through adolescence and into adulthood. Consequently, school psychologists should incorporate screening for DCD when evaluating students with ADHD diagnoses or suspected of having ADHD. This paper provides a review of the underlying brain-behavior relationships between ADHD and DCD, a description of developmental trajectories associated with DCD, and recommended screening and assessment strategies.