The Malay Archipelago also called Insulindia or the Indo-Australian Archipelago is the archipelago between Mainland Southeast Asia and Australia. It has also been called the "Malay world," "Nusantara", "East Indies", and other names over time. The name was taken from the 19th-century European concept of a Malay race, later based on the distribution of Austronesian languages.

The Malay world or Malay realm is a concept or an expression that has been used by different authors and groups over time to denote several different notions, derived from varied interpretations of 'Malay' either as an ethnic group, as a racial category, as a linguistic group or as a cultural group. The use of the term Malay in much of the conceptualisation is largely based on the prevalent Malay cultural influence, manifested in particular through the spread of the Malay language in Southeast Asia as observed by different colonial powers during the Age of Discovery and spread of Islam. The term remains highly controversial in Indonesia and outside the Malay-speaking areas, because it is considered politically charged and irredentist rather than purely cultural.