Since the late nineteenth century, teachers have come together to found associations and unions in Europe and beyond. Drawing on oral histories, primary and secondary documents, and media reports, this paper delves into this rich historical background, leading to the founding of Education International in 1993. In particular it explores the relationships and tensions within and between these predecessor organizations, as well as the ways in which they interacted with the larger political forces of their times. Education International is now a significant organization, representing teachers and related workers situated across 178 countries. This paper attempts to provide a critical historical background for the development of this institution.