大洋洲（Oceania），陆地总面积约897万平方千米，约占世界陆地总面积的6%，是世界上最小的一个大洲。是除南极洲外，世界上人口最少的一个大洲，位于太平洋中部和中南部的赤道南北广大海域中，在亚洲和南极洲之间，西邻印度洋，东临太平洋，并与南北美洲遥遥相对。
大洋洲的英文名称是Oceania ，意思是“被大洋环绕的陆地”，其中“Ocean”表示“大海”，后缀 -ia 表示土地。这一名称出现于1812年，由丹麦地理学家马尔特·布龙（Malte-Brun）杜撰。 英文“Australia”（澳洲）有时也可作为大洲名使用，但其所指范围比Oceania小，不包含美拉尼西亚、密克罗尼西亚和波利尼西亚地区。
大洋洲跨南北两半球，从南纬47°到北纬30°，横跨东西半球，从东经110°到西经160°，东西距离1万多千米，南北距离8000多千米；由一块澳大利亚大陆和分散在浩瀚海域中的无数岛屿组成，包括澳大利亚、新西兰、新几内亚岛（伊里安岛）以及美拉尼西亚、密克罗尼西亚、波利尼西亚三大岛群。
大洋洲有16个独立国家，各国经济发展水平差异显著。澳大利亚和新西兰是发达国家，其他岛国多为农业国，经济比较落后。工业也主要集中在澳大利亚，其次是新西兰。在地理上划分为澳大利亚、巴布亚新几内亚、新西兰、美拉尼西亚、密克罗尼西亚和波利尼西亚六区。
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Oceania, with a total land area of approximately 8.97 million square kilometers, accounts for approximately 6% of the world's total land area and is the smallest continent in the world. It is the continent with the least population in the world, except for Antarctica, located in the vast waters north and south of the equator in the central and central Pacific Ocean, between Asia and Antarctica, bordered to the west by the Indian Ocean, to the east by the Pacific Ocean, and facing North and South America from afar.
The English name of Oceania is Oceania, which means "land surrounded by oceans", where "Ocean" represents "ocean" and the suffix - ia represents land. This name appeared in 1812 and was coined by Danish geographer Malte Brun. The English word "Australia" can sometimes be used as a continental name, but it refers to a smaller area than Oceania and does not include the regions of Melanesia, Micronesia, and Polynesia.
Oceania spans the two hemispheres, from 47 ° S to 30 ° N, from 110 ° E to 160 ° W, with a distance of over 10000 kilometers from east to west and over 8000 kilometers from north to south; Composed of a continent of Australia and numerous islands scattered in vast waters, including Australia, New Zealand, New Guinea (Irian Island), as well as the three major island groups of Melanesia, Micronesia, and Polynesia.
Oceania has 16 independent countries, with significant differences in economic development levels among them. Australia and New Zealand are developed countries, while other island countries are mostly agricultural and have relatively backward economies. Industry is mainly concentrated in Australia, followed by New Zealand. Geographically divided into six regions: Australia, Papua New Guinea, New Zealand, Melanesia, Micronesia, and Polynesia.
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