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There are 1,340^[1][2] recognised ethnic groups in Indonesia. The vast majority of those belong to the Austronesian peoples, with a large minority being Melanesians.^[3][4][5][6]

Based on ethnic classification, the largest ethnic group in Indonesia is the Javanese who make up about 40% of the total population. The Javanese are concentrated on the island of Java, particularly in the central and eastern parts. The Sundanese are the next largest group; their homeland is located in the western part of the island of Java and the southern edge of Sumatra. The Sunda Strait is named after them.^[7] The Malays, Batak, Madurese, Betawi, Minangkabau, and Bugis are the next largest groups in the country.^[8]

Many ethnic groups, particularly in Kalimantan and Papua, have only hundreds of members. Most of the local languages belong to the Austronesian language family, although a significant number of people, particularly in eastern Indonesia, speak unrelated Papuan languages. Indonesians of Chinese, Arab and Indian descent each make up less than 1% of the total Indonesian population.^[8]

The classification of ethnic groups in Indonesia is not rigid and in some cases unclear due to migrations, cultural and linguistic influences; for example, some may consider the Bantenese to be members of the Sundanese people; however, others argue that they are different ethnic groups altogether since they have their own distinct dialects. This is also the case with the Baduy people, who share many cultural similarities with the Sundanese people. An example of hybrid ethnicity is the Betawi people, descended not only from marriages between different peoples native to Indonesia, but also intermarriages with Arab, Chinese and Indian migrants since the era of colonial Batavia (modern-day Jakarta).

Statistics

2010

Number and percentage of population of ethnic groups with more than a million members according to the 2010 census.^[9][a]

The proportions of Indonesian ethnic groups according to the (2000 census) are as follows.^[10] Some ethnic groups which are now recognized as being distinct were subsumed under larger umbrella groups up until 2001. Since the 2010 census, they are counted separately.

Map showing ethnic groups native to Indonesia. Ethnic groups of foreign origin such as Chinese, Arabs and Indians are not shown, but usually inhabit urban areas.

Indigenous ethnic groups

traditional clothing of Biak people.

Most ethnic groups are indigenous to certain regions of Indonesia. Due to migration within Indonesia (as part of government transmigration programs or otherwise), significant proportions of those ethnic groups reside outside of their traditional regions.

• Java: Javanese (Tenggerese, Osing, Banyumasan, etc.), Sundanese (Bantenese, Badui, Ciptagelar), Cirebonese, Betawi, Madurese
• Madura: Madurese
• Sumatra: Malay, Acehnese, Gayo, Alas, Batak, Minangkabau, Rejang, Lampungese, Nias, Mentaweian, Engganese, Kubu, Sekak, and others
• Kalimantan: Dayak, Banjar, Malays, Kutai, and others
• Sulawesi: Makassarese, Buginese, Mandarese, Minahasan, Torajan, Gorontaloan, Bajau, and others
• Lesser Sunda Islands: Balinese, Sasak, Sumbawan, Bimanese, Manggarai, Lamaholot, Dawan, Tetunian, Helong, Roti, Savu, Sumban, Alorese, and others
• Moluccas: Alfur, Ambonese, Nuaulu, Manusela, Wemale, Tanimbarese, and others
• Papua: Dani, Bauzi, Asmat, Amungme, and others (see List of ethnic groups of West Papua)

Non-indigenous ethnicities

Throughout Indonesian history, various ethnic groups of foreign origin spread throughout Indonesia in several migration waves, and usually established themselves in urban centres, seldom settling rural parts of the country.

• Arabs: Arabic settled the Indonesian archipelago, Arabs have lived in Indonesia for a very long time and helped spread Islam in Indonesia ; They are mostly concentrated around Pasar Kliwon in Surakarta, also at Jakarta, Surabaya, Malang, Probolinggo, and Pekalongan.
• Chinese: The most significant ethnic minority of foreign origin in Indonesia, officially amounting to around 2.8 million, with other sources estimating them at anywhere between 2 and 4 million. Chinese people began migrating to Indonesia in the 16th century, with significant waves in the 19th and 20th centuries. They are mostly concentrated in locations called pecinan (chinatowns) in urban Java with significant numbers in Jakarta, Surabaya, Tangerang, North Sumatra, Riau, Riau Islands, Bangka-Belitung Islands, and West Kalimantan. Currently, they have lived together peacefully with the local ethnicities such as the Betawi, Malay, Javanese, and Sundanese; and also, few cities in Indonesia have significant Chinese populations that preserve their heritage links to China. They are spread throughout Indonesian archipelagoes, and significant numbers can be found in Palembang, Jakarta, Surabaya and other coastal cities.
• Indians: Indians (mostly Tamils) also have settled the Indonesian archipelago; They are mostly concentrated in urban centres, with significant numbers around Pasar Baru in Jakarta, and the most well known at Kampung Madras in Medan. Almost 95% of all Indian Indonesians are living in the province of North Sumatra.
• Indos: Indos or Eurasians are people of mixed native Indonesian and Dutch/European ancestry. They emerged in the Dutch East Indies colonial era. Today, less than one million Indonesians with varying degrees of mixed ancestry can trace their ancestors to Europeans. Nowadays, Indos live mostly in Jakarta, many of them having dual citizenship, Dutch and Indonesian. As of 2011, an estimated 124,000 Indos live outside the Netherlands (including Indonesia).^[11]
• Japanese: Japanese people who initially migrated to Indonesia after the defeat of the Japanese empire in World War II. In the years following, the percentage of Japanese people decreased as they had migrated back to Japan, with only small numbers of ex-Japanese soldiers remaining in Indonesia and becoming Indonesian citizens. The recent increase of Japanese residents in Indonesia has been driven by the increase of Japanese business and investment in the country since the 1990s, with majority of those residents being expatriates who retain their Japanese citizenship. They live mostly in Jakarta and Bali.
• Mardijkers: Their name means "freeman" and derives from the Dutch pronunciation of the Malay word "merdeka", which means "free". The ancestors of the Mardijkers were enslaved by the Portuguese in India, Africa and the Malay Peninsula. They were brought to Indonesia by the Dutch East India Company and were freed right after being settled here. Over long periods of time, they have gradually returned to their respective home countries. However, they still exists in small numbers in the capital city today and retains its own distinct culture characteristic of the Mardijker people.