This chapter provides an account of the process of Global Citizenship teacher education in four European countries (Austria, Czech Republic, Ireland and Italy), drawing upon a broader study comparing European Global Citizenship Education (GCED) policy with a special focus on teacher education practices. In Europe, in particular, GCED has been used as an umbrella term to try and be as inclusive as possible to encompass different issues and different political agendas. Research across Europe also demonstrates that non-government organizations and civil society organizations are major drivers in promoting GCED through teacher education. In each country, two settings were selected: a teacher education program internal to the project for in-service primary school teachers funded by the DEAR program and a program outside the project addressing themes related to GCED but organized by an external organization. Everywhere collaboration between actors is perceived as positive or even a necessary element for a successful GCED Teacher Education.