拉穆河是巴布亚新几内亚的河流，位于该国北部，由马当省负责管辖，河道全长640公里，最终注入俾斯麦海，平均流量每秒1,500立方米。

The Ramu is a river in northern Papua New Guinea. The headwaters of the river are formed in the Kratke Range from where it then travels approximately 640 kilometres (398 mi) north-west to the Bismarck Sea.

Along the Ramu's course it receives numerous tributaries from the Bismarck Range to the south and the Finisterre and Adelbert Ranges from the north. During the wet season the Ramu and Sepik Rivers join across the flood plain.