This is a list of notable Irish Americans, including both original immigrants who obtained American citizenship and their American-born descendants. For more information see also: List of Americans of Irish descent.
Howie Carr – author, Boston newspaper columnist and New England radio talk-show host; has claimed family "two-boater" Irish ancestry (i.e., Ireland-to-Canada, then Canada-to-Maine) on his father's side
Alfred Thayer Mahan – naval officer and author whose work, including Sea Power, inspired the creation of the modern United States Navy
Dennis Hart Mahan – guiding light and head of faculty at West Point for decades prior to the Civil War; influential author whose published works were the keystone for spreading engineering knowledge throughout the antebellum United States; his Napoleon seminar at West Point informed Civil War strategies, North and South
John Reynolds – general commanding the right wing of the Army of the Potomac who surprised Lee and committed the Union army to battle at Gettysburg in July 1863; killed in the front lines while personally rallying troops for counterattacks during the first day of fighting
At least 22 presidents of the United States have some Irish ancestral origins, although the extent of this varies. For instance President Clinton claims Irish ancestry despite there being no documentation of any of his ancestors coming from Ireland, but Kennedy on the other hand have strong documented Irish origins. Also Ronald Reagan's great grandfather was an Irish Roman Catholic, and his mother had some Scots-Irish ancestry. James K. Polk also had Scots-Irish Ancestry. Only Kennedy was raised as a practicing Catholic.
11th President, 1845–49: His ancestors were among the first Ulster-Scots settlers, emigrating from Coleraine in 1680 to become a powerful political family in Mecklenburg County, North Carolina. He moved to Tennessee and became its governor before winning the presidency.
15th President, 1857–61: Born in a log cabin (which has been relocated to his old school in Mercersburg, Pennsylvania), 'Old Buck' cherished his origins: "My Ulster blood is a priceless heritage". The Buchanans were originally from Deroran, near Omagh in County Tyrone where the ancestral home still stands. Buchanan also had pre-plantation Irish ancestry being a descendant of the O'Kanes from County Londonderry.
18th President, 1869–77: The home of his maternal great-grandfather, John Simpson, at Dergenagh, County Tyrone, is the location for an exhibition on the eventful life of the victorious Civil War commander who served two terms as President. Grant visited his ancestral homeland in 1878.
21st President, 1881–85: His election was the start of a quarter-century in which the White House was occupied by men of Ulster-Scots origins. His family left Dreen, near Cullybackey, County Antrim, in 1815. There is now an interpretive centre, alongside the Arthur Ancestral Home, devoted to his life and times.
22nd and 24th President, 1885–89 and 1893–97: Born in New Jersey, he was the maternal grandson of merchant Abner Neal, who emigrated from County Antrim in the 1790s. He is the only president to have served non-consecutive terms.
23rd President, 1889–93: His mother, Elizabeth Irwin, had Ulster-Scots roots through her two great-grandfathers, James Irwin and William McDowell. Harrison was born in Ohio and served as a brigadier general in the Union Army before embarking on a career in Indiana politics which led to the White House.
25th President, 1897–1901: Born in Ohio, the descendant of a farmer from Conagher, near Ballymoney, County Antrim, he was proud of his ancestry and addressed one of the national Scotch-Irish congresses held in the late 19th century. His second term as president was cut short by an assassin's bullet.
26th President, 1901-09: His mother, Mittie Bulloch, had Ulster Scots ancestors who emigrated from Glenoe, County Antrim, in May 1729. Roosevelt praised "Irish Presbyterians" as "a bold and hardy race." However, he is also the man who said: "But a hyphenated American is not an American at all. This is just as true of the man who puts "native"* before the hyphen as of the man who puts German or Irish or English or French before the hyphen."  (*Roosevelt was referring to "nativists", not American Indians, in this context)
27th President 1909–13: His great great great grandfather, Robert Taft was born in 1640 in Ireland and immigrated to America, during the mid 17th century. He died in Mendon, Worcester, Massachusetts.
28th President, 1913–21: Of Ulster-Scot descent on both sides of the family, his roots were very strong and dear to him. He was grandson of a printer from Dergalt, near Strabane, County Tyrone, whose former home is open to visitors. Throughout his career he reflected on the influence of his ancestral values on his constant quest for knowledge and fulfillment.
40th President 1981–89: He was the great-grandson, on his father's side, of Irish migrants from County Tipperary who came to America via Canada and England in the 1940s. His mother was of Scottish and English ancestry.
41st President 1989–93: County Wexford historians have found that his now apparent ancestor, Richard de Clare, Earl of Pembroke (known as Strongbow for his arrow skills) – is remembered as a desperate, land-grabbing warlord whose calamitous foreign adventure led to the suffering of generations. Shunned by Henry II, he offered his services as a mercenary in the 12th-century invasion of Wexford in exchange for power and land. He would die from a festering ulcer in his foot, which his enemies said was the revenge of Irish saints whose shrines he had violated. The genetic line can also be traced to Dermot MacMurrough, the Gaelic king of Leinster reviled in history books as the man who sold Ireland by inviting Strongbow's invasion to save himself from a local feud.
42nd President 1993–2001: He claims Irish ancestry despite there being no documentation of any of his ancestors coming from Ireland 
George W. Bush (Irish, Scottish, Dutch, Welsh, French, German & English)
43rd President 2001–09: One of his five times great-grandfathers, William Holliday, was born in Rathfriland, County Down, about 1755, and died in Kentucky about 1811–12. One of the President's seven times great-grandfathers, William Shannon, was born somewhere in County Cork about 1730, and died in Pennsylvania in 1784.
44th President 2009–: His paternal ancestors came to America from Kenya and his maternal ancestors came to America from England. His ancestors lived in New England and the South and by the 1800s most were in the Midwest. His father was Kenyan and the first of his family to leave Africa. His great great grandfather, Falmouth Kearney, was born in the Irish town of Moneygall.
R. Nicholas Burns – American diplomat, Harvard professor, columnist and lecturer; 19th Undersecretary of State for Political Affairs; 17th United States Permanent Representative to NATO; United States Ambassador to Greece 1997-2001
Mark Calaway – pro wrestler with the WWE, known as the "Undertaker"
James Healy – Bishop of Portland, America's first African-American bishop; born a slave according to the laws of Georgia to an Irish immigrant and his beloved African wife; first graduate and valedictorian of Holy Cross College in Massachusetts
Michael Healy – Captain of the Revenue Cutter Bear; defender of Alaska's Native Americans; inspiration for Jack London's The Sea Wolf; prominent figure in James Michener's Alaska; younger brother of James and Patrick Healy
Patrick Healy – President of Georgetown University, considered its second founder; brother of James Healy; first African-American president of an American university; Priest in the Society of Jesus (the Jesuits)
Coco Rocha – Canadian model of Irish, Welsh, and Russian descent
Ellen Ewing Sherman – stepsister and wife of William Tecumseh Sherman. Because they would have needed to buy a slave to help with the children, Mrs. Sherman refused to accompany her husband to command at the Louisiana military academy, which later became LSU. During the Civil War, she and their children took up residence at Notre Dame University, with which her family was closely affiliated.
John L. Sullivan – last bare-knuckle boxing heavyweight champion of the world; first gloved heavyweight champion of the world; first American athlete to become a national celebrity and to earn over $1 million
^ "The important thing to know about Michael Flatley is that he's Irish-American... His success comes from his ability to join unlikely elements together—Irish and Americans, step dancing and flamenco, pretension and frivolity."
^ "William Harnett American, born Ireland, 1848(?)-1892"
^"Archived copy". Archived from the original on 17 March 2006. Retrieved 7 June 2006.CS1 maint: archived copy as title (link) "his father, Elias Disney, an Irish-Canadian, and his mother, Flora Call Disney, who was of German-English descent."
^ "When he and Buchanan squared off on camera to debate the recent Pledge of Allegiance court ruling, they were just another pair of wealthy, middle-aged, white Irish Catholic men pontificating."
^"Archived copy". Archived from the original on 26 March 2006. Retrieved 7 June 2006.CS1 maint: archived copy as title (link) "Dowd is assumed by most people to be a Democrat... in reality she was part of this kind of Irish-Catholic mafia that included Chris Matthews and Mike Kelly..."
^ "Born in Brooklyn in 1935, of Irish immigrant parents, Pete Hamill served in the US Navy, attended Mexico City College..."
^ "Hannity, a proclaimed devout Irish Catholic, has blamed liberals for actions taken..."
^ "But Chris Matthews, the Irish-American host of MSNBC's political talk show "Hardball"..."
^Noonan –  "I pick Dublin because I was there most recently, and also because I'm Irish-American..."
^ "O'Brien, the proud Irishman, clad very casually in denims and navy blue shirt..."
^"Archived copy". Archived from the original on 22 May 2010. Retrieved 23 May 2010.CS1 maint: archived copy as title (link) "O'Brien was named to Irish American Magazine's "Top 100 Irish Americans" on two occasions."
^ "Soledad O'Brien brings her unique heritage of Latino, Irish, and African-American cultures..."
^ "O’Donnell has also been named to Irish American Magazine's 2000 "Top 100 Irish Americans" list."
^ "He was raised Irish-Catholic in Long Island, NY..."
^ "He was the son of an English woman of aristocratic origins and an Irish-born..."
^ "Part of an Irish-American Catholic family, he was the eldest son of Frank and Florence..."
^Russert –  "Irish America magazine has named him one of the top 100 Irish Americans in the country and he was selected as a Fellow of the Commission of European Communities."
^ "I thought that certainly people I grew up with in the Irish Catholic neighborhood in Buffalo would want to read it."
^ "As you may recall, Ed Sullivan, whose heritage was Irish ..."
^ "Born in New Jersey of a Puerto Rican father and Irish American mother, and a self-described army brat..."
^ "I don't know if it comes from being Irish or Catholic or both...."
^ "John Barry was born in a modest thatched cottage in 1745 at Ballysampson on Our Lady's Island, which is part of Tacumshane Parish in County Wexford, Ireland..."
^"Archived copy". Archived from the original on 12 May 2007. Retrieved 18 February 2007.CS1 maint: archived copy as title (link) "A policeman in Ireland, Michael Corcoran became a symbol of what an Irishman – and a Fenian – could make of himself in the New World..."
^ "Hickey is the son of working-class Irish immigrants..."
^ "John and Mary Minah Sheridan, Philip's parents, came to America in 1830 at the urging of John's uncle, Thomas Gainor, living in Albany, New York. John and Mary were second degree cousins from County Cavan, Ireland."
^ "General John Sullivan: His Irish Family Background"
^"John Philip Holland". Rnsubmus.co.uk. Retrieved 15 November 2013. "John Philip Holland was born in Ireland in 1841. He emigrated to America where his first successful submarine design was paid for by Irish nationalists seeking Ireland's liberation from Britain."
^[web.archive.org]. Archived from the original on 22 March 2006. Retrieved 7 June 2006. Missing or empty |title= (help) "Charles McBurney (1845–1913) was an Irish American medical pioneer famous in his field for his early reports about appendicitis."