Specific deficits in information processing in the brain are the commonest causes of academic difficulties in children with ADHD. For many children with ADHD, academic difficulty is not confined to a particular subject but occurs across several areas of study. This chapter explores learning difficulties in ADHD, including common areas of difficulty, including written expression, oral expression, and others. The chapter also discusses when problems become apparent, the causes of learning difficulty in ADHD (poor concentration, impulsivity, working memory impairment, defiance, low self-esteem, social difficulties, poor incentival motivation, auditory processing impairment, difficulties in spelling, handwriting, and organizing), as well as dyslexia and ADHD, and the gifted child with ADHD.