奥林帕斯山（拉丁语：Olympus Mons）是火星上的盾状火山，亦为太阳系中已知最高的山，高于基准面21,229公尺，将近地球珠穆朗玛峰的两倍多，但更贴切的比喻是地球冒纳罗亚火山从海底算起高度（9公里多）的两倍多，因为同样是盾状火山，且山顶都有破火山口。火山宽约600公里，约等于夏威夷群岛的宽度（夏威夷岛至可爱岛）。位于北纬18.4度，东经226度。

在太空船确认它是一座山之前，地面望远镜中的奥林帕斯山是一明亮的亮点，被19世纪后期天文学家命名为「奥林帕斯山之雪」（Nix Olympica）。

Olympus Mons (pronunciation: /əˌlɪmpəs ˈmɒnz, oʊ-, -ˈmɒns/; Latin for Mount Olympus) is a very large shield volcano on the planet Mars. By one measure, it has a height of nearly 22 km (13.6 mi). Olympus Mons stands about two and a half times as tall as Mount Everest's height above sea level. It is the youngest of the large volcanoes on Mars, having formed during Mars's Amazonian Period. It is currently the largest volcano discovered in the Solar System and had been known to astronomers since the late 19th century as the albedo feature Nix Olympica (Latin for "Olympic Snow"). Its mountainous nature was suspected well before space probes confirmed its identity as a mountain.