Off task behavior is the behavior of students who completely detach themselves from the learning environment and involve themselves in things that are not related to learning activities. Off task behavior is a real problem in schools. This off-task behavior can become a habit and have a bad impact on a student because it can affect other students in the class. Therefore, we need techniques or methods to reduce off-task behavior. Group counseling with self-monitoring is one technique for changing behavior. Through group counseling with self-monitoring techniques, it is hoped that students off-task behavior can be reduced. The aim of this research is to determine the effectiveness of group counseling using self-monitoring techniques in reducing off-task behavior. The research subjects were six junior high school students. This research is a Quasi Experimental research using a Pretest Posttest One Group design. The instruments used in this research were interviews and observations using a behavior checklist. Data analysis used the Wilcoxon Signed Rank Test. The research results show that group counseling using Self Monitoring techniques can reduce Off Task Behavior in students. Based on the results of the Wilcoxon test, it is significant 0.028 <0.05, which means Self Monitoring technique is effective in reducing Off Task Behavior