List of Famous people born in Leinster, Ireland

Michael Fitzgerald is an Irish professor of child and adolescent psychiatry, specialising in autism spectrum disorder (ASD). As of June 2005, he said he had diagnosed over 900 individuals with Asperger syndrome.

John Tyndall FRS (; 2 August 1820 – 4 December 1893) was a prominent 19th-century Irish physicist. His initial scientific fame arose in the 1850s from his study of diamagnetism. Later he made discoveries in the realms of infrared radiation and the physical properties of air, proving the connection between atmospheric CO₂ and what is now known as the greenhouse effect in 1859.

Michael Scott was an Irish architect whose buildings included the Busáras building in Dublin, Cork Opera House, the Abbey Theatre and both Tullamore and Portlaoise Hospitals.

Kathleen Watkins is an Irish broadcaster, harpist, actress, singer and author. She is the widow of Gay Byrne.

Richard Brendan Higgins KC*HS, USAF (ret) is an Irish-born American bishop of the Roman Catholic Church. Higgins served as an auxiliary bishop of the Archdiocese for the Military Services, USA from 2004 to 2020.

Thomas Dongan, 2nd Earl of Limerick, was a member of the Irish Parliament, Royalist military officer during the English Civil War, and Governor of the Province of New York. He is noted for having called the first representative legislature in New York, and for granting the province's Charter of Liberties.

Willoughby Hamilton was a co-world No. 1 Irish male tennis player, a footballer and international badminton player.

Paul Cullen was Roman Catholic Archbishop of Dublin and previously of Armagh, and the first Irish cardinal. His Ultramontanism spearheaded the Romanisation of the Catholic Church in Ireland and ushered in the devotional revolution experienced in Ireland through the second half of the 19th century and much of the 20th century. A trained biblical theologian and scholar of ancient languages, Cullen crafted the formula for papal infallibility at the First Vatican Council.

Colm Tóibín FRSL, is an Irish novelist, short story writer, essayist, playwright, journalist, critic, and poet.

Major General Winston Joseph Dugan, 1st Baron Dugan of Victoria,, known as Sir Winston Dugan between 1934 and 1949, was a British administrator and a career British Army officer. He served as Governor of South Australia from 1934 to 1939, then Governor of Victoria until 1949.