James Abram Garfield (November 19, 1831 – September 19, 1881) was the 20th president of the United States, serving from March 1881 until his death in September that year after being shot two months earlier. A preacher, lawyer, and Civil War general, Garfield served nine terms in the United States House of Representatives and is the only sitting member of the House to be elected president. Before his candidacy for the presidency, he had been elected to the U.S. Senate by the Ohio General Assembly—a position he declined when he became president-elect.

Garfield was born into poverty in a log cabin and grew up in northeastern Ohio. After graduating from Williams College in 1856, he studied law and became an attorney. He was a preacher in the Stone–Campbell Movement and president of the Western Reserve Eclectic Institute, affiliated with the Disciples. Garfield was elected as a Republican member of the Ohio State Senate in 1859, serving until 1861. He opposed Confederate secession, was a major general in the Union Army during the American Civil War, and fought in the battles of Middle Creek, Shiloh, and Chickamauga. He was elected to Congress in 1862 to represent Ohio's 19th district. Throughout his congressional service, he firmly supported the gold standard and gained a reputation as a skilled orator. He initially agreed with Radical Republican views on Reconstruction but later favored a Moderate Republican–aligned approach to civil rights enforcement for freedmen. Garfield's aptitude for mathematics extended to his own proof of the Pythagorean theorem, which he published in 1876.

At the 1880 Republican National Convention, delegates chose Garfield, who had not sought the White House, as a compromise presidential nominee on the 36th ballot. In the 1880 presidential election, he conducted a low-key front porch campaign and narrowly defeated the Democratic nominee, Winfield Scott Hancock. Garfield's accomplishments as president included his assertion of presidential authority against senatorial courtesy in executive appointments, a purge of corruption in the Post Office, and his appointment of a Supreme Court justice. He advocated for agricultural technology, an educated electorate, and civil rights for African Americans. He also proposed substantial civil service reforms, which were passed by Congress in 1883 as the Pendleton Civil Service Reform Act and signed into law by his successor, Chester A. Arthur. Garfield was a member of the intraparty "Half-Breed" faction that used the powers of the presidency to defy the powerful "Stalwart" Senator Roscoe Conkling from New York. He did this by appointing Blaine faction leader William H. Robertson to the lucrative post of Collector of the Port of New York. The ensuing political battle resulted in Robertson's confirmation and the resignations of Conkling and Thomas C. Platt from the Senate.

On July 2, 1881, Charles J. Guiteau, a disappointed and delusional office seeker, shot Garfield at the Baltimore and Potomac Railroad Station in Washington. The wound was not immediately fatal, but an infection caused by his doctors' unsanitary methods in treating the wound killed Garfield on September 19. Due to his brief tenure in office, historians tend to rank Garfield as a below-average president or omit him entirely from rankings, though he has earned praise for anti-corruption and pro-civil rights stances.

James Abram Garfield was born the youngest of five children on November 19, 1831, in a log cabin in Orange Township, now Moreland Hills, Ohio. Garfield's ancestor Edward Garfield migrated from Hillmorton, Warwickshire, England, to Massachusetts around 1630. James's father Abram was born in Worcester, New York, and came to Ohio to woo his childhood sweetheart, Mehitabel Ballou, only to find her married. He instead wed her sister Eliza, who was born in New Hampshire. James was named after an earlier son of Eliza and Abram who had died in infancy.

In early 1833, Abram and Eliza Garfield joined a Stone-Campbell church, a decision that influenced their youngest son's life. Abram died later that year, and James was raised in poverty in a household led by his strong-willed mother. He was her favorite child and the two remained close for the rest of his life. Eliza remarried in 1842, but soon left her second husband, Warren (or Alfred) Belden, and a scandalous divorce was awarded in 1850. James took his mother's side in the matter and noted Belden's 1880 death with satisfaction in his diary. Garfield also enjoyed his mother's stories about his ancestry, especially those about his Welsh great-great-grandfathers and an ancestor who served as a knight of Caerphilly Castle.

Poor and fatherless, Garfield was mocked by his peers and became sensitive to slights throughout his life; he sought escape through voracious reading. He left home at age 16 in 1847 and was rejected for work on the only ship in port in Cleveland. Garfield instead found work on a canal boat, managing the mules that pulled it. Horatio Alger later used this labor to good effect when he wrote Garfield's campaign biography in 1880.

After six weeks, illness forced Garfield to return home, and during his recuperation, his mother and a local school official secured his promise to forgo canal work for a year of school. In 1848, he began at Geauga Seminary, in nearby Chester Township, Geauga County, Ohio. Garfield later said of his childhood, "I lament that I was born to poverty, and in this chaos of childhood, seventeen years passed before I caught any inspiration ... a precious 17 years when a boy with a father and some wealth might have become fixed in manly ways."