This research aimed to identify the effectiveness of acceptance and commitment therapy to reduce nomophobia disorder and improve university Engagement among university students.To achieve this goal,the research was conducted on an experimental group of Zagazig University students with a high degree of nomophobia disorder,consisting of 9 students (5 females,4 males).Their ages ranged between (19-21) years,Mean=(20.7) years standard deviation=(4.140),and after applying the nomophobia disorder scale(prepared by Yildrim 2014,translated and codified by the researchers),the university Engagement scale (prepared by the researchers),and the program Acceptance and Commitment Therapy (prepared by the researchers).The results showed that there were statistically significant differences at the level of (0.05)between the average ranks of the scores of the pre- and post-measurements for the members of the experimental group on both the acceptance and action questionnaire and the two measures of nomophobia and university Engagement,and the presence of statistically significant differences at the level of (0.05) between the average ranks of the scores of the members of the experimental and control groups In the post-measurement for the benefit of the experimental group members,While there were no statistically significant differences between the average ranks of the scores of the post and follow-up measurements for the experimental group members on the acceptance and action questionnaire and the nomophobia disorder and university Engagement scales.