Television is one of the electronic media that is commonly accessed in most homes especially by young people who have become familiar with how the medium operates and helps them interact with their environment and beyond. The main objective of the study is to analyze the effects of Television viewing on academic performance of Wolaita Sodo town preparatory school Students. Total sample of 193 respondents were included in the study and the data was collected by using self-administered questionnaire and analyzed using SPSS version 20. The collected data was analyzed by using descriptive statistics, Bi-variate Pearson's correlation and multiple linear regression analysis. Results of Pearson's correlation revealed that there is significant association among the independent variables (time spent on watching television, and time spent on study) and the response variable (academic performance) of preparatory school students. The multiple linear regression result also revealed that the academic performance of preparatory school students is significantly affected by time spent on watching television media, time spent on study, study after watching television and class attendance. Time spent on watching television and generally time used for entertainment rather than study was identified as the most significant factors that affect academic performance of students negatively. Hence, to tackle the problem, parents are encouraged to monitor the shows, films and programs that their children watch. Also, to enhance the students’ academic performance, parents are advised to ensure that high-quality educational programs be made available and children should be encouraged to watch informational, educational and nonviolent movies and programs. And also students should select the programs and manage their time for study and entertainment.