The aim of this study is to reveal the opinions of teachers who deliver Social Studies courses on global citizenship and global citizenship education. A semi-structured interview was conducted with 15 teachers who were interviewed individually and face to face with the purposeful random sampling method. The data were analyzed by content analysis. Based on the findings, it was found that teachers have a positive opinion about global citizenship. Besides, teachers have identified global citizens as individual who have self-awareness of the world and humanity, sensitive to the problems of the world, participant in the sense of rights and responsibilities, non-discriminatory and give importance to solidarity with other people. Teachers have expressed that global citizenship education is necessary to ensure non-discrimination and solidarity in the world in order to communicate with people from cultures. It was also concluded that Social Studies courses are found insufficient to serve global citizenship education in Turkey by teachers.