Managing children’s behaviours associated with attention-deficit/hyperactivity disorder (ADHD) is challenging for parents and teachers. The MEQ-MSSS plan of action (2003) support parental involvement at school in order to promote school success in children with ADHD. However, the current literature provides information on the advantages of parental involvement for the general population. This study describes some aspects of home-school partnership (HSP) for elementary school-age children with ADHD in addition to its effect on school achievement while controlling the family’s income, parental education as well as the child’s IQ and ADHD subtype (hyperactive/impulsive, inattentive, mixed). Results show that HSP is associated with school achievement, particularly for predominantly hyperactive/impulsive children.