澳新界是一个岛屿为主的动物地理分区，包括了澳洲、新几内亚岛屿、东印尼群岛、苏拉威西、龙目岛、松巴洼岛、松巴岛、佛罗勒斯岛及帝汶岛等地。印尼的其他地方却属于东洋界。澳新界包括了几个太平洋的群岛、俾斯麦群岛、瓦努阿图、所罗门群岛及新喀里多尼亚。新西兰及周边的群岛是澳新界中的独特次区域。

在生物学的立场，澳新界跟其他生态区域长期分隔，衍生了独特的生物品种。澳洲和纽几内亚的有袋哺乳动物数目非常大，譬如袋鼠、袋貂和袋熊。

The Australasian zone is an ecozone that is coincident, but not synonymous (by some definitions), with the geographical region of Australasia. The ecozone includes Australia, the island of New Guinea (including Papua New Guinea and the Indonesian province of Papua), and the eastern part of the Indonesian archipelago, including the island of Sulawesi, the Moluccan islands (the Indonesian provinces of Maluku and North Maluku) and islands of Lombok, Sumbawa, Sumba, Flores, and Timor, often known as the Lesser Sundas. The Australasian ecozone also includes several Pacific island groups, including the Bismarck Archipelago, Vanuatu, the Solomon Islands, and New Caledonia. New Zealand and its surrounding islands are a distinctive sub-region of the Australasian ecozone. The rest of Indonesia is part of the Indomalaya ecozone.