Andrew Jackson , 7th U.S. President (1829–1837)
James K. Polk , 11th U.S. President (1845–1849)
James Buchanan , 15th U.S. President (1857–1861)
Andrew Johnson , 17th U.S. President (1865–1869)
Ulysses S. Grant , 18th U.S. President (1869–1877)
Chester A. Arthur , 21st U.S. President (1881–1885)
Grover Cleveland , 22nd & 24th U.S. President (1885–1889 & 1893–1897)
Benjamin Harrison , 23rd U.S. President (1889–1893)
William McKinley , 25th U.S. President (1897–1901)
Theodore Roosevelt , 26th U.S. President (1901–1909)
William Howard Taft , 27th U.S. President (1909–1913)
Woodrow Wilson , 28th U.S. President (1913–1921)
Harry S. Truman , 33rd U.S. President (1945–1953)
Lyndon B. Johnson , 36th U.S. President (1963–1969)
Richard Nixon , 37th U.S. President (1969–1974)
Jimmy Carter , 39th U.S. President (1977–1981)
George H. W. Bush , 41st U.S. President (1989–1993)
Bill Clinton , 42nd U.S. President (1993–2001)
George W. Bush , 43rd U.S. President (2001–2009)
Barack Obama , 44th U.S. President (2009–2017)
DeWitt Clinton , 1812 Federalist Presidential Nominee (unofficial)
Hugh Lawson White , 1836 Whig Presidential Nominee (Southern)
John C. Breckinridge , 1860 Southern Democratic Presidential Nominee
George B. McClellan , 1864 Democratic Presidential Nominee
Horace Greeley , 1872 Liberal Republican Presidential Nominee
James G. Blaine , 1884 Republican Presidential Nominee
William Jennings Bryan , 1896 , 1900 , & 1908 Democratic Presidential Nominee
Adlai Stevenson II , 1952 & 1956 Democratic Presidential Nominee
Al Gore , 2000 Democratic Presidential Nominee
John Kerry , 2004 Democratic Presidential Nominee
John McCain , 2008 Republican Presidential Nominee
This is a list of notable Scotch-Irish Americans , including both original immigrants who obtained American citizenship and their American descendants. The Scotch-Irish trace their ancestry to Lowland Scottish and Northern English people, but through having stayed a few generations in Ulster . This list is ordered by surname within section. To be included in this list, the person must have a Wikipedia article showing they are Scots-Irish American or must have references showing they are Scots-Irish American and are notable.