| Secu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Neamț County |
| Length: | 10km (10miles) |
| Mouth: | Neamț |
| Mouth Location: | Leghin |
| Mouth Coordinates: | 47.2217°N 26.2131°W |
| Mouth Elevation: | 532m (1,745feet) |
| Basin Size: | 37km2 |
| Tributaries Left: | Glodul Mare, Vasău |
| Tributaries Right: | Pârâul Alb, Arșița Mare, Pârâul Rupturilor |
The Secu is a right tributary of the river Neamț in Romania. It flows into the Neamț in Leghin. Its length is 10km (10miles) and its basin size is 37km2.