Military and Police records available online:
- The Irish Military Archives have online collections including the Military Service Pensions Collection, Irish Army Census records, Bureau of Military History, The Collins Papers, An t-Óglach Magazine, The Irish Volunteer, United Nations Unit Histories and much more.
- The National Archives of Ireland holds a collection of the wills of Irish soldiers who died while serving in the British Army. Most of these date from World War I, with a small number from the late 19th century and from the period of the South African War (1899-1902).
- Dublin Metropolitan Police and Civic Guard (Garda Síochána) are Personnel Registers provided by staff of University College Dublin, based on information from the Garda Museum and Archives.
- Dublin Metropolitan Police (DMP) Prisoners Books collection comprises of four volumes containing hand written entries that record the details of daily charge sheets issued by DMP members to offenders or alleged offenders. Each volume contains the name, age, address, occupation, alleged offence and, in most cases, outcome of cases involving over 30,000 people arrested by the DMP.
- The British National Army Museum have enlistment books containing records of Irish soldiers serving in the Connaught Rangers, Leinster Regiment, Royal Dublin Fusiliers, Royal Irish Regiment and the Royal Munster Fusiliers regiments from 1920-22.
- World War I Veterans is a voluntary project which was undertaken to list Ireland’s World War I veterans (1914-1918).
- In Flanders Fields Museum have Irish memorial records for World War I.
- The British National Archives in London have the original British Army records available. The medal card records are useful for World War I servicemen research.
- Ancestry have transcribed service records from World War I.
- Find my past have Pre-1914 service and pension records.