| Lajeado Grande River | |
| Source1 Location: | Rio Grande do Sul state |
| Mouth: | Das Antas River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Lajeado Grande River is a river in the state of Rio Grande do Sul, Brazil. The river empties into the Das Antas River, the upper reaches of the Taquari River.