RESUMEN
Prevalence estimated of conduct disorder, one of the most frequent diagnosed psychiatric conditions in children, vary widely from 0.2% to 8.7%. To find out the prevalence of conduct disorder and its comorbid ADHD in schoolchildren in Bahrain and Saudi. A total 180 students selected randomly were subjected to Conduct disorder scale, demographic questioners, ADHD scale and smi structure interview with the parents. Conduct disorder was found in 4.58 ; the ratio of boys to girls being 4,5:1childhood onset was found in 73% and adolescents onset in 27% mild CD was found in 36%, moderate in 64% and sever conduct disorder in none Comorbid attention deficit disorder was found in 36% hyperactive- impulsive being predominant. The prevalence of CD was 4058% more common in boys, the majority have childhood onset, and one third had comorbid ADRD