白茎眼子菜（学名：Potamogeton praelongus）为眼子菜科眼子菜属下的一个种。

Potamogeton praelongus, commonly known as whitestem pondweed in North America and Long-stalked Pondweed in Britain, is a large, perennial aquatic plant in the family Potamogetonaceae. It is widely distributed in lakes and rivers in the northern hemisphere, but is sensitive to poor water quality.