瑞尼尔山（英语：Mount Rainier），亦称塔科马山（Mount Tacoma）或塔和马山（Mount Tahoma），是一座活火山，属于层状火山，位在美国华盛顿州的皮尔斯县境内，也位于西雅图东南方54英里（87公里）处。瑞尼尔山也是喀斯开山脉的最高峰，海拔4,392公尺。瑞尼尔山也被划分在瑞尼尔山国家公园的范围内。瑞尼尔山被认为是世界上最危险的火山之一，被列入十年火山列表。由于庞大的冰川，瑞尼尔山有可能引发巨大的火山泥流，将威胁到整个浦亚鲁普河山谷。

Mount Rainier (pronounced: /reɪˈnɪər/), Mount Tacoma, or Mount Tahoma is the highest mountain of the Cascade Range of the Pacific Northwest, and the highest mountain in the state of Washington. It is a large active stratovolcano located 54 miles (87 km) south-southeast of Seattle. It is the most topographically prominent mountain in the contiguous United States and the Cascade Volcanic Arc, with a summit elevation of 14,411 ft (4,392 m). Mt. Rainier is considered one of the most dangerous volcanoes in the world, and it is on the Decade Volcano list. Because of its large amount of glacial ice, Mt. Rainier could potentially produce massive lahars that could threaten the entire Puyallup River valley.