Öz Problem Statement: English learning and teaching activities are crucial for Turkish Gendarmerie personnel serving both at home and in various regions of the world. However, there is no sound basis determining the language needs of the gendarmerie organization and personnel to lead them to accomplishment in joint missions.Purpose of Study: This paper aims to investigate the language needs of the Turkish Gendarmerie in terms of English for Specific Purposes. It is expected that determining the language needs of the organization on scientific basis helps to reshape the language curriculum of the gendarmerie and finally it will help the accomplishment of the joint missions in terms of language proficiency.Method: Two questionnaires were administered to 70 gendarmerie personnel who had English learning experience to understand the language needs of the organization. Then the collected data was presented through tables.Findings and Results: The data collected reveals that speaking and writing skills should be emphasized and taken into consideration in assessment. In addition, language materials need to be improved or be supplemented by auxiliary documents.Conclusion and Recommendations: The present study suggests that some steps need to be taken to improve the language proficiency of the gendarmerie personnel to meet the language requirements especially for joint missions. A new language teaching program should be prepared in terms of improving four language skills and topics should be introduced related to the gendarmerie jurisdiction.