纳米比沙漠（Namib是纳马语）是纳米比亚西部的一个沙漠，位于非洲最大的国家公园——纳米比—诺克陆夫国家公园内。沙漠面积50,000平方公里，位于纳米比亚长1,600公里（1,000英哩）的大西洋海岸线，东西阔度由50-160公里（30-100英哩）不等，安哥拉西南部也属于纳米比沙漠范围。这地区被认为是世界上最古老的沙漠，干旱和半干旱的气候已持续了最少8千万年，从大西洋吹向该地区的空气经过寒冷的本吉拉洋流后变得干燥并冷却下沉，形成干旱气候。沙漠每年的降雨量少于10毫米（0.4英吋），几乎寸草不生。

The Namib is a coastal desert in southern Africa. The name Namib is of Nama origin and means "vast place". According to the broadest definition, the Namib stretches for more than 2,000 kilometres (1,200 mi) along the Atlantic coasts of Angola, Namibia, and South Africa, extending southward from the Carunjamba River in Angola, through Namibia and to the Olifants River in Western Cape, South Africa. The Namib's northernmost portion, which extends 450 kilometres (280 mi) from the Angola-Namibia border, is known as Moçâmedes Desert, while its southern portion approaches the neighboring Kalahari Desert. From the Atlantic coast eastward, the Namib gradually ascends in elevation, reaching up to 200 kilometres (120 mi) inland to the foot of the Great Escarpment. Annual precipitation ranges from 2 millimetres (0.079 in) in the most arid regions to 200 millimetres (7.9 in) at the escarpment, making the Namib the only true desert in southern Africa. Having endured arid or semi-arid conditions for roughly 55–80 million years, the Namib may be the oldest desert in the world and contains some of the world's driest regions.