Paramilitary organisations based in Ireland

Largely unemployed British recruits used to support the Royal Irish Constabulary beginning in 1920

former group of trained trade union volunteers from the Irish Transport and General Workers' Union

thumb|Supplement given with the Weekly Freeman of October 1883

The Army Comrades Association (ACA), later the National Guard, Young Ireland and finally League of Youth, known by the nickname the Blueshirts (), was a far-right paramilitary organisation in the Irish Free State, founded in 1932. The group provided physical protection for political groups such as Cumann na nGaedheal from intimidation and attacks by the IRA. Some former members went on to fight for the Francoist faction in the Spanish Civil War.

military unit