Winfield Scott Hancock (February 14, 1824 – February 9, 1886) was a major general in the United States Army and the Democratic nominee for President of the United States in 1880. He served with distinction in the Army for four decades, including service in the Mexican–American War and as a Union general in the American Civil War. Known to his Army as "Hancock the Superb", he was noted in particular for his personal leadership at the Battle of Gettysburg in 1863. His military service continued after the Civil War, as Hancock participated in the military Reconstruction of the South and the United States's western expansion and war with the Native Americans at the Western frontier. This concluded with the Medicine Lodge Treaty. From 1881 to 1885 he was president of the Aztec Club of 1847 for veteran officers of the Mexican-American War.

Hancock's reputation as a war hero at Gettysburg, combined with his status as a Unionist and supporter of states' rights, made him a potential presidential candidate. When the Democrats nominated him for president in 1880, he ran a strong campaign, but was narrowly defeated by Ohio congressman and Republican Party nominee James A. Garfield. Hancock's last public service involved the oversight of President Ulysses S. Grant's funeral procession in 1885.

Winfield Scott Hancock and his identical twin brother Hilary Baker Hancock were born on February 14, 1824, in Montgomery Square, Pennsylvania, a hamlet just northwest of Philadelphia in present-day Montgomery Township. The twins were the sons of Benjamin Franklin Hancock and Elizabeth Hoxworth Hancock. Winfield was named after Winfield Scott, a prominent general in the War of 1812.

The Hancock and Hoxworth families had lived in Montgomery County for several generations, and were of English, Scottish, and Welsh descent. Benjamin Hancock was a schoolteacher when his sons were born. A few years after their birth, he moved the family to Norristown, the county seat, and began to practice law. Benjamin was also a deacon in the Baptist church and participated in municipal government (as an avowed Democrat).

Hancock was at first educated at Norristown Academy, but removed to the public schools when the first one opened in Norristown in the late 1830s. In 1840, Joseph Fornance, the local Congressman, nominated Hancock to the United States Military Academy at West Point. Hancock's progress at West Point was average. He graduated 18th in his class of 25 in 1844, and he was assigned to the infantry.

Hancock was commissioned a brevet second lieutenant in the 6th U.S. Infantry regiment, and initially was stationed in Indian Territory in the Red River Valley. The region was quiet at the time, and Hancock's time there was uneventful. Upon the outbreak of war with Mexico in 1846, Hancock worked to secure himself a place at the front. Initially assigned to recruiting duties in Kentucky, he proved so adept at signing up soldiers that his superiors were reluctant to release him from his post. By July 1847, however, Hancock was permitted to join his regiment in Puebla, Mexico, where they made up a part of the army led by his namesake, General Winfield Scott.

Scott's army moved farther inland from Puebla unopposed and attacked Mexico City from the south. During that campaign in 1847, Hancock first encountered battle at Contreras and Churubusco. He was appointed a brevet first lieutenant for gallant and meritorious service in those actions. Hancock was wounded in the knee at Churubusco and developed a fever. Although he was well enough to join his regiment at Molino del Rey, fever kept Hancock from participating in the final breakthrough to Mexico City, something he would regret for the rest of his life. After the final victory, Hancock remained in Mexico with the 6th Infantry until the treaty of peace was signed in 1848.

Hancock served in a number of assignments as an army quartermaster and adjutant, mostly in Fort Snelling, Minnesota, and St. Louis, Missouri. It was in St. Louis that he met Almira ("Allie") Russell and they married on January 24, 1850. Allie gave birth to two children, Russell in 1850 and Ada in 1857, but both children died before their parents. Hancock was promoted to captain in 1855 and assigned to Fort Myers, Florida. Hancock's young family accompanied him to his new posting, where Allie Hancock was the only woman on the post.