| Santău | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Satu Mare County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Cehal, Cehăluț, Tășnad, Santău, Sudurău |
| Length: | 35km (22miles) |
| Source1: | Cehal |
| Mouth: | Ier |
| Mouth Location: | Sudurău |
| Mouth Coordinates: | 47.5393°N 22.443°W |
| Basin Size: | 169km2 |
| Tributaries Left: | Cean, Săuca |
| Tributaries Right: | Orbău, Valea Neagră |
| Custom Label: | River code |
| Custom Data: | III.1.44.33.28.3 |
The Santău is a left tributary of the river Ier in Romania. It flows into the Ier near Sudurău.[1] Its length is 35km (22miles) and its basin size is 169km2.