Internet use increased significantly in the last decade through the development of portable technologies, like laptops, smart-phones, tablets etc. Time spent on Internet could became a problem for many users, some of them reporting a sense of control loss, as they begin to stay more on-line than they initially wanted. Gaming, shopping, gambling, social networking, visiting pornographic sites, e-mailing, all these activities could transform an apparently inoffensive mean of communication into the trigger of a behavioral addiction. We applied individual cognitive-behavioral therapy (CBT) in three cases of Internet addiction, with cognitive re-structuring based on a diary of dysfunctional thoughts, relaxation techniques, and coping skills training, with good results. CBT was structured in bi-weekly sessions, of 30 minutes duration, for 6 weeks. Time spent on-line and daily functioning were the main variables monitored. A very important issue is to address all potential factors that could maintain the disorder, like social skills deficits, personality disorders, other co-morbid addictions, anxiety or depressive symptoms etc. Elements of motivational interview could be helpful especially at first visit, but also during therapy, when danger of relapse surfaces. Cue exposure with prevention of response is another technique that had proven itself useful in several sessions, when automatic thoughts challenge appeared to have reached a dead point. An informant like a close relative of the patient should be involved in the therapy whenever possible, due to the fact that Internet addiction therapy, like any other addiction therapy, need a third party to offer feed-back regarding patient's changes under treatment.