The purpose of this study was to examine teachers’ attitudes and perceptions regarding the integration and development of Emotional Intelligence (ΕΙ) in preschool, primary, and secondary teaching levels within the school context. ΕΙ is a gateway to a balanced life. It is a major factor for a healthy development of interpersonal relationships, whether we are referring to relationships in personal or professional life. Because of its importance, teachers should be informed and trained how to develop their ΕΙ and how to cultivate and strengthen their students’ ΕΙ. In this study is presented an online questionnaire which was designed in order to assess teachers’ attitudes and perceptions regarding El development in Greek schools. Psychometric evaluation on data from 242 teachers indicates that the proposed scale is valid and reliable.