The Malay Archipelago refers to the vast group of islands located between mainland Southeast Asia (Indochina) and Australia. These islands constitute the territory of Indonesia, the Philippines, Brunei, the Malaysian states of Sarawak and Sabah and Federal Territory of Labuan, East Timor, and Papua New Guinea. There are, however, arguments for excluding the last-named country for cultural and geographical reasons. Papua New Guinea is culturally quite different from the other countries in the region, and the island of New Guinea itself is arguably not part of Asia as the other islands are (see Australia-New Guinea}.

The archipelago is sometimes also known as the East Indies, but some authorities apply a much broader meaning to this term by including the Indian Subcontinent, Indochina, and even areas as far west as Iranian Baluchistan.

The Malay Archipelago is an archipelago of archipelagoes. There are many island groups within it. The major ones are:

• The Greater Sunda Islands
• The Lesser Sunda Islands
• The Moluccas
• The Philippines

The island group's area is more than 2 million km², and its total population is more than 300,000,000. The biggest islands in the archipelago are Borneo and Sumatra (New Guinea would be the biggest if it were included). The most heavily populated island is Java.

Together with Australia, the Malay Archipelago marks the traditional boundary between the Pacific Ocean to the east and the Indian Ocean to the west.

Geologically the archipelago is very interesting, being one of the most active vulcanological regions in the world. Geological uplifts in the region have also produced some impressive mountains, culminating in Mount Kinabalu in Sabah with a height of 4 175 m (or Puncak Jaya in Irian Jaya at 4 884 m, if New Guinea is included).

The climate throughout the archipelago, owing to its position astride the equator, is tropical. It is notably rainier in the west than in the east, however.

de:Indonesischer Archipel et:Malai saarestik nl:Insulinde