| River Calder | |
|---|---|
 The River Calder | |
 | |
| Native name | Caladar (Scottish Gaelic) |
| Location | |
| Country | Scotland |
| Council area | Renfrewshire (mainly) |
| Towns/villages | Lochwinnoch |
| Physical characteristics | |
| Mouth | Castle Semple Loch |
• coordinates | 55°47′34″N 4°37′03″W / 55.79285°N 4.61739°W |
The River Calder (Scottish Gaelic: Caladar) is a river mainly within Renfrewshire, Scotland.