| Guo River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | China |
| Subdivision Type2: | State |
| Subdivision Name2: | Henan, Anhui |
| Subdivision Type3: | Region |
| Subdivision Name3: | Northern China and Eastern China |
| Subdivision Type5: | Cities |
| Subdivision Name5: | Kaifeng, Bozhou |
| Length: | 261.5miles, Northwest-Southeast |
| Source1 Location: | Near Kaifeng, Henan province, China |
| Mouth: | Huai River |
| Mouth Location: | Huaiyuan County, Anhui Province, China |
| River System: | Huai River watershed |
| Basin Size: | 6141sqmi |
| Tributaries Left: | Huiji River, Tiedi River, Dasha River, Zhaowang River, Wujia River |
| Tributaries Right: | You River |
The Guo River is a major tributary river on the left bank of Huai River. The source of Guo River is near Kaifeng, Henan province, which is very close to Yellow River. This river is generally an abandoned course of Yellow River. It does not have a remarkable water source and is recharged mainly by groundwater, rainwater and other rivers. Due to the influence of the changing path of Yellow River, the path of Guo River changed frequently throughout the history. The last time Guo River changed its path was during the 1938 Huayuankou flood of the Yellow River. Guo River reaches the Huai River in Anhui province. Guo River is almost entirely located on the plain. The total head of the entire Guo River is only about 59 meters which indicates a very low gradient. The lower section of Guo River is navigable.