Background: Most teachers have a misunderstanding of the criteria for bullying and how to define it, and this can be reduced by increasing knowledge of bullying and how to deal with bullying cases. Aim of the study: to assess the teachers' perception regarding bullying among preparatory school students in Port Said City. Design: A descriptive research design was utilized. Setting: This study was conducted at five preparatory schools located in Port Said City. One preparatory school was randomly selected from each district, (Gamal Abd El Nasser, Al Masjid Al Aqsa, El-Zahoor, El-Obour, and El-Canal school). Sample: A purposive sample and a multistage sampling technique were used in this study.  Subjects and methods:  349 teachers from five schools Tools of data collection: two tools were used to collect the necessary data including teachers ' perception questions and teachers' bullying behavior Results: the total scores of studied teachers' perception levels for bullying (79.02%) for the bullying perception, teachers had a negative behavior about bullying with (24.81%) of the total mean scores, and there was a statistically significant correlation between teacher's perceptions and behavior regarding bullying. Conclusion: According to the study's findings more than half of teachers in schools do not know about bullying, teachers' behavior is negative towards bullying, and there is no relationship between the teacher's perception and their personality characteristics. Recommendations: Based on the results of this research, there must be a bullying prevention program that focuses on the bullying prevention process in schools.