The Chinese Exclusion Act of 1882 was a United States federal law signed by President Chester A. Arthur on May 6, 1882, prohibiting all immigration of Chinese laborers for 10 years. The law made exceptions for travelers and diplomats. The Act also denied Chinese residents already in the US the ability to become citizens and Chinese people traveling in or out of the country were required to carry a certificate identifying their status or risk deportation. It was the first major US law implemented to prevent all members of a specific national group from immigrating to the United States, and therefore helped shape twentieth-century immigration policy.

Passage of the law was preceded by growing anti-Chinese sentiment and anti-Chinese violence, as well as various policies targeting Chinese migrants. The act followed the Angell Treaty of 1880, a set of revisions to the US–China Burlingame Treaty of 1868 that allowed the US to suspend Chinese immigration. The act was initially intended to last for 10 years, but was renewed and strengthened in 1892 with the Geary Act and made permanent in 1902. These laws attempted to stop all Chinese immigration into the United States for ten years, with exceptions for diplomats, teachers, students, merchants, and travelers. The laws were widely evaded.

In 1898, the Supreme Court ruled in United States v. Wong Kim Ark that the law did not prevent the children of Chinese immigrants born in the United States from acquiring birthright citizenship.

The law remained in force until the passage of the Chinese Exclusion Repeal Act in 1943, which repealed the exclusion and allowed 105 Chinese immigrants to enter the United States each year. Chinese immigration later increased with the passage of the Immigration and Nationality Act of 1952, which abolished direct racial barriers, and later by the Immigration and Nationality Act of 1965, which abolished the National Origins Formula.

During the 19th century, China was in a state of sociopolitical upheaval due to poverty, droughts, famines, and conflicts such as the Opium Wars and Taiping Rebellion. These conditions led to large waves of Chinese immigration to Southeast Asia, Europe and the Americas.^{[better source needed]} In particular, many of the Chinese immigrants who entered the United States during the 19th century were refugees who were fleeing the Punti-Hakka Clan Wars, which claimed as many as one million lives. For this reason, most of the Chinese immigrants originated from Sze Yup and spoke Taishanese.

The first significant wave of 19th-century Chinese immigration to America began with the California gold rush of 1848–1855; it continued with subsequent large labor projects, such as the building of the first transcontinental railroad. During the early stages of the gold rush, when surface gold was plentiful, the Chinese were tolerated by white people, if not well received. However, as gold became harder to find and competition increased, animosity toward the Chinese and other foreigners increased. After being forcibly driven from mining by a mixture of state legislators and other miners (the Foreign Miner's Tax), the immigrant Chinese began to settle in enclaves in cities, mainly San Francisco, and took up low-wage labor, such as restaurant and laundry work. With the post-Civil War economy in decline by the 1870s, the anti-Chinese animosity became politicized by labor leader Denis Kearney and his Workingman's Party as well as by California governor John Bigler, both of whom blamed "coolie labor" for depressed wage levels. In addition to economic pressures, US cultural products had long promoted racist views of Chinese people. Public opinion and law in California began to demonize Chinese workers and immigrants in any role, with the latter half of the 1800s seeing a series of ever more restrictive laws being placed on Chinese labor, behavior and even living conditions. While many of these legislative efforts were quickly overturned by the State Supreme Court, many more anti-Chinese laws continued to be passed in both California and nationally.

In the early 1850s, there was resistance to the idea of excluding Chinese migrant workers, since they provided essential tax revenue. The Xianfeng Emperor, who ruled China at the time, supported the exclusion because he was concerned that Chinese immigration to America would lead to a loss of labor for China. But toward the end of the decade, the financial situation improved and state level exclusion laws were passed. In 1858, the California Legislature passed a law that made it illegal for any person "of the Chinese or Mongolian races" to enter the state; however, this law was struck down by the State Supreme Court in 1862.

The Chinese immigrant workers provided cheap labor and did not use government schools, hospitals, and such because the Chinese migrant population was predominantly healthy male adults. January 1868, the Senate ratified the Burlingame Treaty with China, allowing an unrestricted flow of Chinese into the country. As time passed and more and more Chinese migrants arrived in the United States and California in particular, violence often broke out in cities such as Los Angeles. The North Adams strike of 1870, broken by the replacement of all workers by 75 Chinese men was the trigger that sparked widespread working-class protest across the country, shaped legislative debate in Congress, and helped make Chinese immigration a sustained national issue.