Sri Lankan Tamils (Tamil: , ilankai tamiar ? or , at tamiar), also known as Ceylon Tamils or Eelam Tamils, are Tamils native to the South Asian island state of Sri Lanka. Today, they constitute a majority in the Northern Province, live in significant numbers in the Eastern Province and are in the minority throughout the rest of the country. 70% of Sri Lankan Tamils in Sri Lanka live in the Northern and Eastern provinces.Modern Sri Lankan Tamils descend from residents of the Jaffna Kingdom, a former kingdom in the north of Sri Lanka and Vannimai chieftaincies from the east. According to the anthropological and archaeological evidence, Sri Lankan Tamils have a very long history in Sri Lanka and have lived on the island since at least around the 2nd century BCE.

The Sri Lankan Tamils are mostly Hindus with a significant Christian population. Sri Lankan Tamil literature on topics including religion and the sciences flourished during the medieval period in the court of the Jaffna Kingdom. Since the beginning of the Sri Lankan Civil War in the 1980s, it is distinguished by an emphasis on themes relating to the conflict. Sri Lankan Tamil dialects are noted for their archaism and retention of words not in everyday use in Tamil Nadu, India.

Since Sri Lanka gained independence from Britain in 1948, relations between the majority Sinhalese and minority Tamil communities have been strained. Rising ethnic and political tensions following the Sinhala Only Act, along with ethnic pogroms carried out by Sinhalese mobs in 1956, 1958, 1977, 1981 and 1983, led to the formation and strengthening of militant groups advocating independence for Tamils. The ensuing civil war resulted in the deaths of more than 100,000 people and the forced disappearance and rape of thousands of others. The civil war ended in 2009 but there are continuing allegations of atrocities being committed by the Sri Lankan military. A United Nations panel found that as many as 40,000 Tamil civilians may have been killed in the final months of the civil war. In January 2020, President Gotabaya Rajapaksa said that the estimated 20,000+ disappeared Sri Lankan Tamils were dead. The end of the civil war has not fully improved conditions in Sri Lanka, with press freedom not being restored and the judiciary coming under political control.One-third of Sri Lankan Tamils now live outside Sri Lanka. While there was significant migration during the British colonial to Singapore and Malaysia, the civil war led to more than 800,000 Tamils leaving Sri Lanka, and many have left the country for destinations such as Canada, United Kingdom, Germany and India as refugees or emigrants. According to the pro-rebel TamilNet, the persecution and discrimination that Sri Lankan Tamils faced has resulted in some Tamils today not identifying themselves as Sri Lankans but instead identifying themselves as either Eelam Tamils, Ceylon Tamils, or simply Tamils. Many still support the idea of Tamil Eelam, a proposed independent state that Sri Lankan Tamils aspired to create in the North-East of Sri Lanka. Inspired by the Tamil Eelam flag, the tiger also used by the LTTE, has become a symbol of Tamil nationalism for some Tamils in Sri Lanka and the Sri Lankan Tamil diaspora.

Sri Lanka (UK: , US: (listen); Sinhala: ශ්‍රී ලංකාව, romanized: Śrī Laṅkā (IPA: [ʃriː laŋkaː]); Tamil: இலங்கை, romanized: Ilaṅkai (IPA: [ilaŋɡaj])), formerly known as Ceylon, and officially the Democratic Socialist Republic of Sri Lanka, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, and southeast of the Arabian Sea; it is separated from the Indian subcontinent by the Gulf of Mannar and the Palk Strait. Sri Lanka shares a maritime border with India and the Maldives. Sri Jayawardenepura Kotte is its legislative capital, and Colombo is its largest city and financial centre.

Sri Lanka's documented history goes back 3,000 years, with evidence of prehistoric human settlements that dates to at least 125,000 years ago. It has a rich cultural heritage. The earliest known Buddhist writings of Sri Lanka, known collectively as the Pāli canon, date to the fourth Buddhist council, which took place in 29 BCE. Sri Lanka's geographic location and deep harbours have made it of great strategic importance, from the earliest days of the ancient Silk Road trade route to today's so-called maritime Silk Road. Because its location made it a major trading hub, it was already known to both Far Easterners and Europeans as long ago as the Anuradhapura period. The country's trade in luxury goods and spices attracted traders of many nations, which helped to create Sri Lanka's diverse population. During a period of great political crisis in the Sinhalese kingdom of Kotte, the Portuguese arrived in Sri Lanka (largely by accident) and then sought to control the island's maritime regions and its lucrative external trade. Part of Sri Lanka became a Portuguese possession. After the Sinhalese-Portuguese war, the Dutch and the Kingdom of Kandy took control of those areas. The Dutch possessions were then taken by the British, who later extended their control over the whole island, colonising it from 1815 to 1948. A national movement for political independence arose in the early 20th century, and in 1948, Ceylon became a dominion. The dominion was succeeded by the republic named Sri Lanka in 1972. Sri Lanka's more recent history was marred by a 26-year civil war, which began in 1983 and ended decisively in 2009, when the Sri Lanka Armed Forces defeated the Liberation Tigers of Tamil Eelam.Today, Sri Lanka is a multinational state, home to diverse cultures, languages, and ethnicities. The Sinhalese are the majority of the nation's population. The Tamils, who are a large minority group, have also played an influential role in the island's history. Other long established groups include the Moors, the Burghers, the Malays, the Chinese, and the indigenous Vedda.The island has had a long history of engagement with modern international groups: it is a founding member of the SAARC and a member of the United Nations, the Commonwealth of Nations, the G77, and the Non-Aligned Movement. Sri Lanka is the highest-ranked South Asian nation on the Human Development Index and has the second-highest per capita income in South Asia.