This open access book is a new survey of theatre practices in Ireland from 1957 to the present. Part I: Histories, situates the theatrical activity of twentieth and twenty-first century Ireland within its social and political contexts, identifies key practitioners, landmark productions, institutions, festivals, and seminal revivals. Part II: Theories, offers five key theoretical frameworks - nation, language, body, space and interculturalism - to examine contemporary Irish theatre practices. Contemporary Irish Theatre and Performance ultimately offers a more extensive story of contemporary Irish theatre documenting the diversity of practices and contributors that have populated the contemporary Irish theatre landscape since 1957.