This study aimed to identify the training needs of the in-service primary school teachers in the city of Benghazi, Libya. Data collection involved the administration of a set of questionnaire to 420 teachers and interviews with ten of them. The study found that the most important training needs of the primary school teachers in terms of classroom management were: (i) training on how to improve students' behavior through the development of codes of conduct for the students at the beginning of the school year, (ii) training on efficient time management to achieve the objectives of the classroom session, and (iii) training on means of modifying the abnormal behavior of the students. Data from the interview revealed some of the methods used by the participants on addressing issues and challenges faced in handling the students. The study supports the importance of organizing classroom management training to in-service primary school teachers to help them manage the classroom effectively.