Local Government (Ireland) Act 1919

The Local Government (Ireland) Act 1919 (9 & 10 Geo. 5 c. 19) is an Act of the Parliament of the United Kingdom of Great Britain and Ireland which provided that local government elections in Ireland would be conducted on a system of proportional representation by means of the single transferable vote (PR-STV). This replaced the previous system of first-past-the-post in single-member districts and block voting in multi-member districts.

Sligo Corporation had introduced PR-STV under a private act of parliament ahead of an election in 1919. The first local elections in the rest of the country took place in 1920.

Under the Local Government (Ireland) Act 1898, Ireland had been divided into district electoral divisions and wards. Under the provisions of the 1919 Act, the Local Government Board for Ireland was required to divide the local government areas into local electoral areas, variously named as:
 * county electoral areas, for the election of county councillors, in each county;
 * district electoral areas, for the election of rural district councillors in each rural district, and for the election of urban district councillors in each urban district;
 * borough electoral areas, for the election of aldermen and councillors, in each borough, including county boroughs;
 * poor law electoral areas, for the election of guardians, in so much of every union as was situated in an urban district; and
 * town electoral areas for the election of town commissioners, in each town.

The Government of Ireland Act 1920 enacted the partition of Ireland, creating separate jurisdictions of Southern Ireland and Northern Ireland in effect from 1921. It introduced PR-STV for the House of Commons of Northern Ireland and the House of Commons of Southern Ireland.

Southern Ireland became the Irish Free State in 1922 (Éire from 1937). PR-STV continued in use for all elections. The act itself was repealed under the Electoral Act 1963. The division of local government areas into LEAs has been re-enacted in later legislation, up to the Local Government Act 2001.

In Northern Ireland, PR-STV was abolished under the Local Government Act 1922, with a reversion to first-past-the-post for 1924 Northern Ireland local elections, the first local elections held in the new jurisdiction. FPTP was introduced for the Northern Ireland House of Commons for the 1929 election. PR-STV was reintroduced for local elections from 1972, and is still in use.