Background: The internet is become an integral part of nursing students' life and is the most useful technology. Internet addiction is defined as an impulse-control disorder of internet use that has an adverse impact on major life domains. Aim: This study aimed to assess the influences of internet addiction on academic achievement among technical health institute nursing students. Design: Descriptive exploratory research design was utilized in this study. Setting: Technical Health Institute of Nursing at Dar El Shefa hospital. Subjects: A convenient sample of all nursing students (160) in all five classes of the academic year 2021-2022, Tools of data collection: (1) Nursing students' assessment questionnaire, consists of three parts a. demographic characteristics of the technical health institute nursing students, b. the academic achievement assessment tool, c. factors related to internet addiction . (2) Internet Addiction Test. Results: The current study found that the most factors affect internet addiction among technical health institute nursing students was the others factors which represent 66.9% of students, then lack of knowledge which represent 64.4% of students, then 59.4% affected by personal factors, 58.1% by social factors and lastly 56.9% affected by psychological factors. There was a statistically significant and negative connection between total internet addiction and total factors scores at p-value of 0.05*, there was a statistically significant difference between total achievement with internet addiction and total factors. Conclusion: Less than two thirds of nursing students had severe level of internet addiction. The nursing students' academic achievement represented that the highest percentage of excellent achievement was in the third year, while the lowest percentage was in the second year at the end of the academic year. Most of the studied factors that affected on internet addiction were (others factors, knowledge factors, personal, social and finally psychological factors). There was significant association between students' total academic achievements and internet addiction. Recommendations: awareness programs for safe use of the internet should be provided for technical health institute nurse students in order to decrease the prevalence of internet addiction.