List of Famous people born in Leinster, Ireland

James Haughton, nicknamed "Vegetable" Haughton, was an Irish social reformer, temperance activist and vegetarian.

Walter Hussey Burgh was an Irish statesman, barrister and judge; he sat in the Irish House of Commons, and was considered to be one of its outstanding orators. He served briefly as Chief Baron of the Exchequer in the last year of his life.

Sir William Johnson, 1st Baronet, was an Irish official of the British Empire. As a young man, Johnson moved to the Province of New York to manage an estate purchased by his uncle, Admiral Peter Warren, which was located amidst the Mohawk, one of the Six Nations of the Iroquois League. Johnson learned the Mohawk language and Iroquois customs, and was appointed the British agent to the Iroquois. Because of his success, he was appointed in 1756 as British Superintendent of Indian Affairs for the northern colonies. Throughout his career as a British official among the Iroquois, Johnson combined personal business with official diplomacy, acquiring tens of thousands of acres of Native land and becoming very wealthy.

David Richard Beatty, 1st Earl Beatty, was a British Royal Navy officer.

Gormlaith ingen Murchada (960–1030), sometimes spelled Gormflaith, was an Irish queen.

Admiral Sir Peter Warren, KB was a British naval officer from Ireland who commanded the naval forces in the attack on the French fortress of Louisbourg, Nova Scotia in 1745. He later sat as MP for Westminster.

Charles Agar, 1st Earl of Normanton, was an Anglo-Irish Protestant clergyman. He served as Archbishop of Dublin from 1801 to 1809.

Major General Sir Edward Michael Pakenham,, was a British Army officer and politician. He was the son of The Baron Longford and the brother-in-law of The Duke of Wellington, with whom he served in the Peninsular War. During the War of 1812, he was commander of British forces in North America (1814–15). On 8 January 1815, Pakenham was killed in action while leading his men at the Battle of New Orleans.

Pierce Butler was an Irish-American South Carolina rice planter, slaveholder, politician, officer in the Revolutionary War, and Founding Father of the United States. He served as a state legislator, a member of the Congress of the Confederation, a delegate to the 1787 Constitutional Convention, where he signed the United States Constitution, and a member of the United States Senate.