The National Rifle Association of America (NRA) is a gun rights advocacy group based in the United States. Founded in 1871 to advance rifle marksmanship, the modern NRA has become a prominent gun rights lobbying organization while continuing to teach firearm safety and competency. The organization also publishes several magazines and sponsors competitive marksmanship events. The group claimed nearly 5 million members as of December 2018,^[update] though that figure has not been independently confirmed.

The NRA is among the most influential advocacy groups in U.S. politics. The NRA Institute for Legislative Action (NRA-ILA) is its lobbying division, which manages its political action committee (PAC), the Political Victory Fund (PVF). Over its history, the organization has influenced legislation, participated in or initiated lawsuits, and endorsed or opposed various candidates at local, state, and federal levels. Some notable lobbying efforts by the NRA-ILA are the Firearm Owners Protection Act, which lessened restrictions of the Gun Control Act of 1968, and the Dickey Amendment, which blocks the Centers for Disease Control and Prevention (CDC) from using federal funds to advocate for gun control.

Starting in the mid- to late 1970s, the NRA has been increasingly criticized by gun control and gun rights advocacy groups, political commentators, and politicians. This criticism began following changes in the NRA's organizational policies, following what is now referred to as the Revolt at Cincinnati at the 1977 NRA annual convention. The changes, which deposed former NRA executive vice president Maxwell Rich and included new organizational bylaws, have been described as moving the organization away from its previous focuses of "hunting, conservation, and marksmanship" and toward a focus on the defense of the right to bear arms. The organization has been the focus of intense criticism in the aftermath of high-profile shootings, such as the Sandy Hook Elementary School shooting and the Parkland High School shooting, after both of which they suggested adding armed security guards to schools.

A few months after the Civil War began in 1861, a national rifle association was proposed by Americans in England. In a letter that was sent to President Abraham Lincoln and published in The New York Times, R.G. Moulton and R.B. Perry recommended forming an organization similar to the National Rifle Association in Britain, which had formed a year and a half earlier. They suggested making a shooting range, perhaps on the base on Staten Island, and were offering Whitworth rifles for prizes for the first shooting competition with those rifles. They suggested a provisional committee to start the Association which would include: President Lincoln, Secretary of War, officers, and other prominent New Yorkers.

The National Rifle Association of America was chartered in the State of New York on November 17, 1871 by Army and Navy Journal editor William Conant Church and Captain George Wood Wingate. On November 25, 1871, the group voted to elect its first corporate officers. Union Army Civil War General Ambrose Burnside, who had worked as a Rhode Island gunsmith, was elected president. When Burnside resigned on August 1, 1872, Church succeeded him as president.

Union Army records for the Civil War indicate that its troops fired about 1,000 rifle shots for each Confederate hit, causing General Burnside to lament his recruits: "Out of ten soldiers who are perfect in drill and the manual of arms, only one knows the purpose of the sights on his gun or can hit the broad side of a barn." The generals attributed this to the use of volley tactics, devised for earlier, less accurate smoothbore muskets.

Recognizing a need for better training, Wingate sent emissaries to Canada, the United Kingdom, and Germany to observe militia and armies' marksmanship training programs. With plans provided by Wingate, the New York Legislature funded the construction of a modern range at Creedmoor, Long Island, for long-range shooting competitions. The range officially opened on June 21, 1873. The Central Railroad of Long Island established a railway station nearby, with trains running from Hunter's Point, with connecting boat service to 34th Street and the East River, allowing access from New York City.

After beating England and Scotland to win the Elcho Shield in 1873 at Wimbledon, then a village outside London, the Irish Rifle Team issued a challenge through the New York Herald to riflemen of the United States to raise a team for a long-range match to determine an Irish-American championship. A team was organized through the subsidiary Amateur Club of New York City. Remington Arms and Sharps Rifle Manufacturing Company produced breech-loading weapons for the team. Although muzzle-loading rifles had long been considered more accurate, eight American riflemen won the 1874 Irish-American Match firing breech-loading rifles. Publicity of the event generated by the New York Herald helped to establish breech-loading firearms as suitable for military marksmanship training, and promoted the NRA to national prominence.