1830 in Ireland

Events

• February – first Roman Catholics take their seats in the House of Commons at Westminster, among then Daniel O'Connell and Richard More O'Ferrall.
• 12 July – Orange Institution parades lead to confrontations between Orangemen and Ribbonmen in Maghera and Castledawson in County Londonderry. Several Catholic homes are burned by Protestants following these clashes.
• July – potato crop failure the previous year leads to widespread famine. Food riots in Limerick and Leitrim.
• August – first Dublin Horse Show.
• November – Ribbonmen attack an Orange band, puncturing some of their drums. The Orangemen retaliate by burning the Catholic village of Maghery, County Armagh, to the ground.
• ;Undated
• :* The Remonstrant Synod of Ulster is formed by non-subscribing Presbyterians.
• :* T. & A. Mulholland open the 8000-spindle York Street flax mill in Belfast.
• :* Austins established in the Diamond, Derry. At closure in 2016 it will be the world's oldest independent department store.
• :* Sir Jonah Barrington is removed from the judiciary following an Address to the King by both Houses of Parliament, a unique event.
• :* William Carleton publishes Traits and Stories of the Irish Peasantry and Confessions of a Reformed Ribbonman, a fictionalised account of the Wildgoose Lodge Murders of 1816.
• :* The private Markree Observatory is set up.

  Births

• 1 January – William James Lendrim, soldier, recipient of the Victoria Cross for gallantry in 1855 at the Siege of Sevastopol, Crimea.
• 10 April – John Sullivan, recipient of the Victoria Cross for gallantry in 1855 at Sebastopol, in the Crimea.
• 1 May – Mary Harris "Mother" Jones, labor and community organizer, member of the Industrial Workers of the World, and Socialist in America.
• 12 May – Maurice O'Rorke, politician and Speaker of the New Zealand House of Representatives.
• 25 May – Hugh Nelson, politician in Canada and Lieutenant-Governor of British Columbia.
• 23 July – John O' Leary, Fenian poet.
• 12 August – John O'Connor, painter.
• 29 August – Charles Bowen, politician in New Zealand.
• 16 September – Patrick Francis Moran, third Archbishop of Sydney.
• 20 September – Arthur Thomas Moore, soldier, recipient of the Victoria Cross for gallantry in 1857 at the Battle of Khushab, Persia.
• 20 September – Hans Garrett Moore, soldier, recipient of the Victoria Cross for gallantry in 1877 at Komgha, South Africa.
• October – John Connors, soldier, recipient of the Victoria Cross for gallantry in 1855 at Sebastopol in the Crimea.
• 22 November – Justin McCarthy, politician, historian and novelist.
• 24 December – Harry Hammon Lyster, recipient of the Victoria Cross for gallantry in 1858 at Calpee, India.
• ;Full date unknown
• :*Brian Dillon, Fenian leader.
• :*Robert Dwyer Joyce, music collector and writer.
• :*Charles McCorrie, soldier, recipient of the Victoria Cross for gallantry in 1855 at Sebastopol, in the Crimea.
• :*William R. Roberts, diplomat, Fenian Society member and United States Representative from New York.
• :*Eyre Massey Shaw, Superintendent of the Metropolitan Fire Brigade.

  Deaths

• 26 June – George IV of the United Kingdom of Great Britain and Ireland.
• 11 October – Richard John Uniacke, lawyer, politician, member of Nova Scotia Legislative Assembly and Attorney General of Nova Scotia.