This study sought to assess the training competencies of the school supervisors in charge of implementing the programs of the training centers in the general directorates of education in the Sultanate of Oman. The study followed a descriptive method. A questionnaire was used to collect data and information. This questionnaire was used with a sample of 225 school directors from five directorates in these regions: North Al Sharquiyya, Al Dakhiliyya, North Al Batinah, South Batinah, and Dhahira. The study found that the school supervisors had a great deal of knowledge from the point of view of school directors. This had to do with the subject knowledge and application as well as in terms of technological skills. The results also revealed that there were statistically significant variations at (a≤0.05) in the responses which should be attributed to the gender variable. The results also revealed that there were no significant variations at the level of (a≤0.05) in the responses of the directors which should be attributed to the variables of experience and qualification. The study ended with several recommendations including in particular providing incentives for the supervisors of the school administration who implement the programs of the training centers in the general directorates of education in Sultanate by encouraging them and rewarding them for their efforts and developing their administrative competencies.