The Australasian Mediterranean Sea is a mediterranean sea located in the area between Southeast Asia and Australasia. It connects the Indian and Pacific oceans. It has a maximum depth of 7,440 m and a surface area of 9.08 mil. km².

In contrast to the American Mediterranean Sea and Mediterranean Sea, it is not surrounded by continents, only by islands and peninsulas. It includes the following seas:

1. South China Sea - 3.5 million km
2. Banda Sea - 695,000 km
3. Arafura Sea - 650,000 km
4. Timor Sea - 610,000 km
5. Java Sea - 320,000 km
6. Gulf of Thailand - 320,000 km
7. Gulf of Carpentaria - 300,000 km
8. Celebes Sea - 280,000 km
9. Sulu Sea - 260,000 km
10. Flores Sea - 240,000 km
11. Molucca Sea - 200,000 km
12. Gulf of Tonkin - 126,250 km
13. Halmahera Sea - 95,000 km
14. Bali Sea - 45,000 km
15. Savu Sea - 35,000 km
16. Joseph Bonaparte Gulf - 26,780 km
17. Seram Sea - 12,000 km
18. Straits of Johor
19. Riau Strait
20. Karimata Strait
21. Lombok Strait
22. Luzon Strait
23. Makassar Strait
24. Ombai Strait
25. Strait of Malacca
26. Qiongzhou Strait
27. Singapore Strait
28. Taiwan Strait
29. Sunda Strait
30. Gaspar Strait
31. Wetar Strait

States or territories with a coast on the Australasian Mediterranean Sea are: Australia, Brunei, China, Indonesia, Cambodia, Malaysia, Papua New Guinea, Philippines, Singapore, Taiwan, Thailand, Timor-Leste and Vietnam. It includes the straits of Malacca, Singapore and Luzon, and adjoins the peninsulas of Indochina and Malaysia. The following islands are located within it:

• Bathurst Island, Groote Eylandt, Hainan Dao, Phú Quốc, Ko Chang, Samui archipelago, Nang Yuan, Ko Phangan, Ko Samui, Ko Tao, Tioman, Melville islands, Maluka islands, New Guinea, Paracel Islands, Pratas Island, Philippines, Riau Islands, Sangir Archipelago, Spratly Islands, Greater Sunda Islands (Borneo, Sumatra, Java, Sulawesi), Lesser Sunda Islands (Bali, Flores, Komodo Islands, Lombok, Sumba, Sumbawa, Timor), Taiwan, and Talaud Islands.

• East Indian Archipelago
• Maritime Southeast Asia