The aim of the Regional dossiers series is to provide a concise description of European minority languages in education. Aspects that are addressed include features of the education system, recent educational policies, main actors, legal arrangements and support structures, as well as quantitative aspects such as the number of schools, teachers, pupils, and financial investments. Every Regional dossier begins with an introduction about the region concerned, followed by six sections that each deals with a specific level of the education system (e.g. primary education). Sections eight and nine cover the main lines of research into education of the concerned minority language, the prospects for the minority language in general and for education in particular. The tenth section gives a summary of statistics. Lists of regulations, publications and useful addresses concerning the minority language, are given at the end of the dossier. This dossier discusses Irish, or Gaeilge, an indigenous language spoken in the Republic of Ireland and in Northern Ireland. It is a Celtic language closely related to Scottish Gaelic and Manx, and more distantly related to Welsh, Breton and Cornish. Speakers of Irish in Northern Ireland are predominantly second language learners and most people learn the language through the education system or at informal language classes held throughout Northern Ireland. Irish Medium Education is a growing sector in both the Republic of Ireland and in Northern Ireland. [This regional dossier was originally compiled by Aodán Mac Póilin from Ultach Trust/Iontaobhas Ultach and Mercator Education in 1997. It was updated by Róise Ní Bhaoill from Ultach Trust/Iontaobhas Ultach in 2004. It has been updated by Réamonn Ó Ciaráin from Gael Linn in 2018.]