圣保罗河是西非的河流，发源自畿内亚东南部，其后在邦加以北约50公里进入利比里亚，最终在蒙罗维亚注入大西洋，河道全长约500公里，流域面积约21,900平方公里。

• Encyclopædia Britannica entry
• World River Discharge Database

The Saint Paul River is a river of western Africa. Its headwaters are in southeastern Guinea. Its upper portion in Guinea is known as the Diani River or Niandi River, and forms part of the boundary between Guinea and Liberia.

The river then enters Liberia about 50 km (31 mi) north of Gbarnga and crosses Liberia in a southwesterly direction. It empties into the Atlantic Ocean at Cape Mesurado in Monrovia near Bushrod Island, separating Monrovia from its suburb Brewerville.