Background and purpose: Previous researches indicated a relationship between impulsivity and Internet addiction. This study was conducted to compere the symptoms of attention deficit-hyperactivity disorder (ADHD) in Internet addicted and non-addicted university students.

Materials and methods: This comparatevi study was performed in 311 individuals who were selected by convenience sampling. Data was collected using the Young’s Internet addiction test and Conners' Adult ADHD Rating Scales (CAARS). Data was analysed applying ANOVA in SPSS V.16.

Results: The results showed higher scores of ADHD in Internet-addict students compared with students not addicted to Internet (P=0.001).

Conclusion: Current results are consistent with previous findings proving that individuals addicted to Internet have more ADHD symptoms than those not addicted to Internet.