List of Famous people born in Leinster, Ireland

Henry Welbore Agar-Ellis, 2nd Viscount Clifden SA, styled The Honourable Henry Agar between 1776 and 1789, was an Irish politician.

Robert "Robin" Francis Ruttledge MC (1899–2002) was an Irish ornithologist, also known as "The Major", who is best remembered for his work in the systematic recording and conservation of Irish birds over a period of sixty years.

Sir William Cleaver Francis Robinson was an Irish governor and musical composer, who wrote several well-known songs. He was born in County Westmeath, Ireland, and was educated at home and at the Royal Naval School. He joined the Colonial Office service in 1858 and became the president of Montserrat in 1862. He married Olivia Edith Deane in 1862. He began serving as governor of the Falkland Islands in May 1866 and governed Prince Edward Island from 1870–1873, helping the island join a union with Canada. He became the governor of the Leeward Islands in 1874 and served his first term as the Western Australia governor from 1875–1877. He was appointed governor of the Straits Settlements in 1877 and served as governor of Western Australia a second term from April 1880 to February 1883.

Admiral of the Fleet Matthew Aylmer, 1st Baron Aylmer, of Covent Garden, Westminster, and Westcliffe, near Dover, was an Anglo-Irish Royal Navy officer and Whig politician who sat in the English and British House of Commons between 1695 and 1720.

General Sir Eric de Burgh, was a British Army officer who became Chief of the General Staff in India.

Tommy Breen was an Irish footballer who played as a goalkeeper for, among others, Belfast Celtic, Manchester United, Linfield and Shamrock Rovers. Breen was a dual international and played for both Ireland teams: the IFA XI and the FAI XI.

Sir Nicholas Plunkett (1602–1680) was an Anglo-Irish lawyer and politician. The son of Christopher Plunkett, 9th Baron Killeen and Jane Dillon, daughter of Sir Lucas Dillon, his brother Luke was created Earl of Fingall in 1628. At the age of twenty Plunkett traveled to London to receive training as a lawyer at Gray's Inn in London, and later trained at King's Inn in Dublin. By the 1630s he had established a thriving legal practice: the attempts by Thomas Wentworth, the Lord Lieutenant of Ireland, to confiscate as much Irish land as possible to the Crown, ensured that his services were in high demand. At this time he also became an MP in the Irish House of Commons, sitting for Meath.

Sir Frederick Matthew Darley was the sixth Chief Justice of New South Wales, an eminent barrister, a member of the New South Wales Parliament, Lieutenant-Governor of New South Wales, and a member of the British Privy Council.

Robert Bourke, 1st Baron Connemara, was a British Conservative politician and colonial administrator. He served as Under-Secretary of State for Foreign Affairs between 1874 and 1880 and 1885 and 1886, and was Governor of Madras between 1886 and 1890.

Bartholomew Lloyd (1772–1837) was an Irish mathematician and academic whose entire career was spent at Trinity College Dublin. As Erasmus Smith's Professor of Mathematics there, he promoted significant curricular reforms, including the introduction of the teaching of calculus, Later he served as Provost of the college.