| Mandekal Aru | |
| Pushpin Map: | Sri Lanka |
| Subdivision Type1: | Country |
| Subdivision Name1: | Sri Lanka |
| Subdivision Type2: | Province |
| Subdivision Name2: | Northern Province |
| Subdivision Type3: | Districts |
| Subdivision Name3: | Mullaitivu, Kilinochchi |
| Length: | 30km (20miles) |
| Source1 Location: | Mullaitivu District |
| Mouth: | Palk Bay |
| Basin Size: | 297km2 |
The Mandekal Aru is a river in Northern Province, Sri Lanka. The river rises in the western Mullaitivu District, before flowing north through Mullaitivu District and Kilinochchi District. It empties into Palk Bay.[1]