This guide is designed to help those conducting research in all aspects of Irish military history. Commissioned by the Military Heritage of Ireland Trust, which was established in 2000 to foster knowledge of this heritage, it lists the institutions, archives, public bodies and organizations that specifically hold relevant information on military heritage, relating from the earliest times to the present day. Also included is a listing of fortifications, battle sites and places in Ireland relevant to military events in its broadest sense. Where possible, email, website and telephone details are also included, as are museum and archival depositories opening times. The guide is completed with an extensive bibliography listing books and articles that have been published on military history, particularly those in the last twenty years.