加瓦尔油田（Ghawar Oil field）位于沙特阿拉伯东部，首都利雅得以东约500km处，是目前全球探明储量最大的油田，也是世界最大的陆上油田，总储量超过700亿桶。而世界最大的海上油田则是巴西里约的里贝拉油田，油气探明总储量约在260亿至420亿桶之间。

加瓦尔油田探明储量达112亿吨，年产量高达2.8亿吨，占整个波斯湾地区的30％。腊量少，多为轻质油，凝固点低于-20℃，便于运输。有输油管通腊斯塔努拉油港（世界最大油港）外运。沙特阿拉伯于1948年在波斯湾盆地发现的迄今为止世界上最大的陆上油田，并于1951年开始投产。产层为侏罗系碳酸盐岩，深度2200米，油田面积为3264平方千米。2005年剩余可采储量还有700亿桶（95.5亿吨）。

Ghawar (Arabic: الغوار) is an oil field located in Al-Ahsa Governorate, Eastern Province, Saudi Arabia. Measuring 280 by 30 km (174 by 19 mi), it is by far the largest conventional oil field in the world, and accounts for more than half of the cumulative oil production of Saudi Arabia. Ghawar is entirely owned and operated by Saudi Aramco, the state run Saudi oil company. Relatively little technical information is publicly available, because the company and Saudi government closely guard field performance data and per-field production details. Available information is predominantly historical (pre-nationalization), from incidental technical publications, or anecdotal.