This study aims at finding out the degree of Public Schools Principals\\\' application in the State of Al dakhlia Governate, Sultanate of Oman to Halben Theory in Leadership. To achieve the objectives of the study, a questionnaire composed of (28) items was designed. After checking the validity and reliability of the questionnaire, (120) members of the study group composed of (Managers, and master teachers ) were requested to respond to the questionnaire items during the academic year 2016/2017. To evaluate the responses, ( means, standard deviation, differential analysis and T-test ) were employed. The study highlighted a number of results, the most important of which are: The degree of practicing the degree of Public Schools Principals\\\' application in the State of Al dakhlia Governate Sultanate of Oman to Halben Theory in Leadership is average. The absence of statistically significant differences in the school principals\\\' practice in the State of Al dakhlia Governate Sultanate of Oman to Halben Theory in Leadership at the level of (a = 0.05) is due to the effects of (experience , academic qualification and gender).In the light of the findings, the researcher Suggest the following: The need for school principals to collaborate with teachers in the preparation of educational plans and follow-up implementation, and to help teachers to use evaluation strategies, and to provide a democratic social environment within the school that supports teachers and enhances their roles.