This study aimed to assess the knowledge of internet addiction among adolescents in selected colleges of Tirupathi. A descriptive research approach with a non-experimental research design was adopted for this study. Non-probability convenient sampling technique was used to select the participants (n=60). Intermediate students from Sri Chaitanya College, Tirupati were selected. A self-structured questionnaire was administered as a tool and the collected data was analyzed. The study result showed that among 60 students, 31 (51.67%) Had inadequate knowledge, 28 (46.67%) Had moderate knowledge and 1 (1.67%) Had adequate knowledge regarding the consequences of internet addiction. There is no statistically significant association between the levels of knowledge of adolescents on internet addiction with their demographic variables.