Infobox ethnic group | group = Kadazan Dusun Mamasok | image = Penampang Sabah Joanna-Datuk-Kitingan-with-Bobohizan-01.jpg | caption = Kadazandusun priests and priestesses attires during the opening ceremony of Kaamatan 2014 at Hongkod Koisaan, the unity hall of KDCA | population = 555,647 (2010) | popplace = | langs = Dusunic languages (especially Dusun and Kadazan), Sabah Malay, Malaysian, English | rels = Christianity (Mainly Roman Catholic) (74.8%), Sunni Islam (22.6%), Momolianism | related = Dusun, Rungus, Kadazan, Orang Sungai, Murut, Lun Bawang/Lun Dayeh | footnotes = ^a Yearbook of Statistics: Sabah, 2002 & Sabah Statistics 2020 Data Kadazan-Dusun (also written as Kadazandusun or Mamasok Kadazan-Dusun) are an amalgamation of the two closely related indigenous peoples in Sabah, Malaysia that is Kadazan and Dusun people. The Kadazandusun is the largest ethnic group in the state. They are also known as Mamasok Sabah, meaning "indigenous people of Sabah". The traditional worldview according to Kadazan-Dusun tradition mentiones that they are the descendants of Nunuk Ragang. Kadazan-Dusun is recognised as an indigenous nation of Borneo with documented heritage by the United Nations Educational, Scientific and Cultural Organization (UNESCO) since 2004. Kadazan-Dusun is part of bumiputera group in Malaysia and has its own special rights from land rights, rivers, education and maintaining their own customs. Several organisations have been established to safeguard the privileges of Kadazan-Dusun in Malaysia and one of them is Pertubuhan Kadazan-Dusun Murut (KDM) Malaysia based in Donggongon, Penampang, Sabah, Malaysia. In 2004, Richard Francis Tunggolou of Kg. Maang, Penampang wrote an article The Origins and Meanings of the terms “Kadazan” and “Dusun" and carried out an extensive research exploring the many possible explanations and theories about the origins and meanings of the word ‘Kadazan’ and ‘Dusun’. The article may very well confirm that there is no such race as ‘Kadazandusun’ as being propagated by some.