The aim of this study is to investigate the relationship between Internet Addiction, Generalized Anxiety Disorder and Depression among Lebanese University students in light of some variables such as gender, university and specialization. The sample consisted of (504) Lebanese university students (males and females) aged between18-20 years, who were registered in the Lebanese university (253) of them were registered in Faculty of Literature and Human Sciences & the other (251) students were registered in Faculty of Sciences. Results showed higher levels of internet addiction among students of Human Science Faculty, more than students of the Science Faculty. Results also showed positive significant correlation between Internet Addiction and Anxiety & positive significant correlation between Internet Addiction and Depression. On the other hand, it showed significant statistical differences between males and females in internet addiction in such away that females were more addicted on internet than males. Results also showed significant differences in internet addiction among students due to specific major only in the Faculty of Science.